Our parish sponsored four mainly young people on a two year organ scholarship in the Royal Irish Academy of Music.

Where I live (in Canada), there are scholarships available for prospective organ students through local chapters of the RCCO (similar to the AGO). They have 4 times as many available for under-30's than over 30's. I won an over-30 one last year (I am WAAAAY over 30 lol). Maybe AGO has similar? I know it's not Catholic per se, but it does support developing church musicianship.

The system ghmus7 described is a great thing to add to your parish program. When I was a sophomore in college, my university parish added choral section leader scholarships for 4 student (soprano, alto, tenor, bass). The parish serves a very large state school with a superb music program, so their goal is to hire Catholic students at the university and give them real on-the-ground experience. As a scholarship recipient over three years, I got to sing masterworks and stepped in to lead rehearsal/Mass on occasion when our DM was out. That was invaluable experience and I'm very grateful he took the initiative to set up the program.

I don't think you need to draw from a university base. I can see something like this being modified to work at a parish where there are any young people at all and just create the program to fit your needs/abilities. My younger brother is an excellent organist and became the inaugural "organ scholar" at our home parish while still in high school. I also think of programs like Mary Ann Carr Wilson's Canticle that trains young musicians. My older sister created a chorister program at a parish. I really think if you can find someone who's willing to carve out the time and commitment to rehearse and prepare for once- or twice-weekly meetings, advertise for a youth choir and you'll get a group of motivated students. Mandatory "auditions" and/or a nominal fee will create a very self-selected group. In the programs I've seen that have been successful, you start with this and work from there. In my job, I inherited an existing after-school liturgical choir, so I added the layer of training student cantors. It's been a great success. I think I'll start adding theory training next year on a voluntary basis using the Voice for Life program.