Thanks for your questions and comments. I think you've got it, yes!! The history of c 603 grew out of a situation in which a number of solemnly professed monks had discerned vocations to solitude over long years of monastic life, ongoing formation, commitment, and service. To retell the story briefly, in order to follow an eremitical vocation they had to leave their vows and monasteries and be secularized. They then had to find a way to live an eremitical life as best as they could apart from their monasteries in more ordinary surroundings. Roman Catholicism had a history of such persons coming under the protection of the diocesan bishop and eventually this occurred with a dozen or so of these men coming together in a laura under the aegis of Bishop Remi de Roo who, at Vatican Council II, brought up the need to recognize the genuine eremitical vocation as a "call to perfection." Only after another 20 years did the Revised Code of Canon Law include the solitary hermit call in law in canon 603.
The canon itself presumes and implies a personal history of spiritual and personal formation as a hermit prior to contacting one's diocese re c 603 even though it does not spell this out. For instance, "stricter separation from the world" is not simply about closing the hermitage door on the things outside these premises, but rather about separating oneself more strictly from the things which are contrary to or reject Christ while one cleaves to Christ more strictly and wholeheartedly with all one has and is. Assiduous prayer and penance are not about more prayer and penance than usual in Religious life, or at least it is not only about this; it is primarily about being a truly human person whose heart, mind, body and spirit, are given over to their source, ground, nourishment, and enrichment in God alone in the silence of solitude.In other words, c 603 was never meant for beginners in the spiritual life, nor were dioceses meant to form such persons in the eremitical life. (I'll say more about this below.) Canon 603 was meant to be used for hermits (not those who were still hermit wannabe's) who had lived into their vocations over a span of time and brought themselves to their diocese because they recognized that this service (eremitical life lived in and on behalf of the Church) was an essential part of their call to life in solitude. It was meant, this means, to be relatively rarely used when strong candidates with experience as contemplatives and deeper yearnings for solitude presented themselves with a petition to be professed. The canon defines eremitical life as the Catholic Church regards it and adds certain conditions to those who feel called to live this life as an ecclesial vocation in the name of the Church.
In some ways this is a tension-filled and paradoxical situation. The Church defines the signs and ways to genuine freedom in Christ found in hermit lives throughout her history and otherwise: stricter separation from the world, a life of assiduous prayer and penance, the silence of solitude, ordered according to a Rule the hermit writes herself, framed in terms of the Evangelical Counsels, and then provides a canonical framework to live such freedom in the name and on behalf of the Church. In this way, the Church entrusts an ecclesial vocation to someone committed to the freedom of a prophetic life of grace. Thus, the person should also have the wisdom to deal with a vocation which is at once ecclesial and also deeply prophetic. None of this indicates or implies a vocation which is to be embraced by beginners or those without sufficient experience and (even) expertise (e.g., the ability to write a liveable Rule, for instance, or an articulable sense of the way the silence of solitude functions as more than the context for one's life -- a sense which is rooted in the hermit's lived experience).Dioceses do not and apparently were never meant to form hermits. This is so not only because hermits are formed in solitude (you restated my position very well), but also because dioceses tend to need time frames into which the formation program can fit without lots of flexibility or freedom --- for the hermit and for the Holy Spirit! And eremitical vocations require time, freedom, and greater flexibility sometimes than canonical norms can ensure. Also, while dioceses have within them people who could effectively accompany a hermit in her formation and discernment, the diocesan offices of Vicar for Religious, etc., ordinarily don't have the time even if they should have the expertise and willingness (and my sense is this is rare). However, after the hermit is formed in an essential way, and know they are called to eremitical life (which may require the assistance of a Delegate for the Diocese and Hermit candidate), dioceses (beyond the Delegate) are precisely the ones to assist in the discernment of a c. 603 vocation. Thus, your final question is exactly right. Dioceses should think that c 603 is to be used to (admit) to canonical standing a vocation that has been long in development and is already largely "formed". After all, there are other ways to live eremitical life. C 603 is only one way and not everyone is meant to live as a solitary hermit in the name of the Church even when their eremitical vocation seems very certain.
Again, because I believe in this approach to c 603 vocations, I have written about a process which can work for dioceses and for hermits and their Directors (diocesan delegates). It is not a program, but a process drawn organically from the requirements of c 603 itself, and for that reason does not impose arbitrary time frames or stages which are more appropriate for coenobitical religious life. I believe the canon was artfully (wonderfully!) wrought; it stresses the freedom of the hermit within a given set of essential (not optional!) characteristics. The addition of additional and strict time frames, etc., which are not drawn from the canon itself will actually "offend" against the sufficiency and beauty of the canon and the life it defines. Ironically, only a process drawn directly from the canon itself can do justice to the canon and the vocation it governs.