Thanks, you have provided a difficult constellation of questions and also something of a leap from my admitted concern with such things. I will drop the term "interfere" from your first question and replace it with "connect with those responsible" or perhaps, "intervene in some appropriate way" in order to share one's concerns.
That done, I need to say that any person with genuine knowledge directly impacting the nature and quality (and this can include even the validity) of a public profession has not just the right but the obligation to share that knowledge in an appropriate way. Moreover, bishops and others involved in overseeing such vocations have the obligation to hear and seriously consider these concerns. Public professions involve ecclesial vocations which affect the entire Church. They are also public acts of worship and if there is actual deception or fraud at their heart, such an act of worship can become a serious scandal and that can rise to the level of sacrilege. It can also invalidate the profession being made -- one source of the scandal involved. When we are dealing with Canon 603 professions where the total number of solitary canonical hermits are, relatively speaking, so very few and the vocation is both rare and even more rarely understood --- and also because dioceses are cautious in dealing with the implementation of C 603 anyway --- serious scandal can affect the credibility of the entire vocation. When this happens, genuine vocations to C 603 life are likely to be further prevented from being professed by the Church --- a kind of functional suppression of the solitary consecrated eremitical vocation.
What Steps does one take?
Depending upon the seriousness of the problem and one's own degree or kind of involvement and expertise, one may take a number of steps. The first will be prayer, and prayer will accompany any other steps one takes. If one has a relationship with the one being professed, one will generally contact them first to state one's concerns and allow a clarifying response. One will certainly confer confidentially with those in one's life who understand such concerns and can give feedback on how they would proceed (pastors, spiritual directors, religious in roles of formation or leadership, et al). In very serious cases, especially if any responses one has gotten from the persons involved are unsatisfactory, one might seek the advice of a canon lawyer to be sure one's assessment of seriousness is correct and to see what other steps one may need to consider taking.Beyond this, one may decide one needs to write the bishop of the diocese in which the profession has taken or is to take place to inform him of one's concerns. Generally speaking, I think this is usually as far as one would take the situation because one trusts that the bishop knows more about the situation than one does oneself. However, sometimes writing the bishop, though usually essential, is insufficient; occasionally one's own knowledge may be greater than the bishop's or the situation is greater than this specific profession per se seems. In such cases, one may also be advised to contact the bishop's Metropolitan and even the US Nuncio as the direct US representative to/of the Vatican.
Being sure of Serious and even Grave Matters:
None of this should ever be done lightly, of course, and one needs to be really sure one understands the situation fully and has a good sense of the nature of the vocation one is concerned about. With c 603 there is a tendency already for some bishops and chanceries to say something like, [[Whom will it hurt?]] when deciding to profess non-hermits under c 603 because they tend not to understand eremitical life more generally, nor the significance of c 603 and what it witnesses to, more specifically. But because such professions do cause harm, including to the person seeking to be professed and assuming public responsibility in law for this vocation despite their not being called in this way by God, it may take someone living the vocation to clarify why such a profession is a mistake. I am not saying that such a profession is necessarily a mistake that rises to the level of scandal and beyond (ordinarily it may be rooted in simple ignorance), but this "whom does it harm?" approach does reflect a somewhat careless attitude about c 603 vocations which can allow for the stopgap use of the canon in much more seriously abusive situations as well.It is in these more serious situations that I personally would probably contact the folks in authority with my concerns and knowledge. I not only believe I can do this, for several different reasons, but also that I am obligated to do this. The question in such an instance is how do I do this in a way which is most charitable and most educative re: the c 603 vocation --- and that is where the majority of the prayer accompanying the entire discernment process in such a matter comes in. I think one must accept that if one's intervention (letters, consultations, conversations, etc) prevent a profession under c 603 there will be significant pain for the person so affected and too, there will likely be personal pain and anguish for oneself as well. However, there is something larger than the individual proposing to make public vows involved here, namely the well-being of the vocation itself which is a Divine gift and the faith of the assembly/church, and one must accept that as well.
Once Again, "Whom does it Hurt?"
At the same time, it must be made vividly clear that allowing someone to take on public responsibilities for a vocation they do not have is hardly charitable to them either. Doing so invites the person to live with the senses of failure, mediocrity, and hypocrisy all their days, something which is surely a cause of constant pain and doubt pervading everything they are and do. Eremitical life is not about relaxing day in and day out in some form of extended vacation; it is not entered into so that one may do one's painting or writing or pottery, or even research and scholarship, etc. Eremitical life is about the hard (but also painful and joyful) work of seeking God, being grasped by God, and allowing oneself to be remade in and by God in every moment and mood of one's life --- and doing so in the silence of solitude. Absolutely there will be some space and time for activities like those mentioned as well as some limited ministry in one's parish if one truly feels called to these, but these will, first of all, serve one's vocation to "the silence of solitude", not substitute for it.In fact, such activities will have to be relinquished or modified to some extent the moment they distract or detract from one's eremitical vocation of living "with God alone". In other words, even what one might perceive as meaningful and fruitful work contributing to the good of mankind would need to be relinquished if it conflicted with one's call to live with and for "God alone" in eremitical solitude!! Also, because we are all social creatures, most folks are called to personal wholeness and holiness in community, not in the silence of solitude. Very few are called to this (or will even understand it), and for that reason, for most people, such a calling would be dangerous to and destructive of their very personhood, their very selves. It is critical that all discernment of authentic solitary eremitical vocations recognizes this or the result of our professions will be fraudulent, inauthentic, mediocre, unhappy, possibly psychologically unbalanced, and disedifying "hermits" created by their professions to live the terms of c 603. Again, how could this be considered charitable or a truly pastoral decision on the part of a diocesan bishop?
Finally, let me say that someone attempting to be professed for a vocation they do not, in their heart of hearts, truly believe they have from God --- and here I mean the vocation itself, not the profession it allows or requires, the time and space it provides for various activities, as a means to some other end, and so forth, but the vocation itself --- says with their whole lives how little they esteem this vocation, those who truly do have it and frankly, the God who calls people in this way! I have been in contact with several people over the years who sought or considered seeking admission toBut of course, this demeans the entire idea and nature of profession and certainly, all of the genuine discernment people do before ever being admitted to profession. It was offensive to anyone with a vocation to consecrated life. It was offensive to anyone charged with the ministries of discernment and formation. Moreover, it was offensive to the whole church which believes that God calls people --- recognizably and for God's own purposes --- to true vocations and that the church (hierarchy, representatives, and other leadership) must attend to these calls as seriously as God means them to. We have come a long way from the early days of Canon 603 and reflection on the vocation leaves us with no reason to treat it as a relatively insignificant or otherwise meaningless catch-all. We recognize the vocation is relatively rare, but perhaps too, that it is more meaningful for that very reason. In particular, this means that those in authority must not encourage, much less yield to the temptation to use C 603 as a stopgap means to profession simply because other vocational avenues are not open to a candidate.