While that is still a concept I feel has potential, it's obviously something that should be done in tandem with the other Works authors; and it'd be a long work, I think.
. . . No, what I was actually considering is the same rough idea as the Moon Cell one (a couple of the Seldarine intervene and send him back to a TYPE-MOON-iverse), but shunting my SI to Fate/Kaleid Liner Prisma Illya instead. This has a few advantages:
1) I actually have the anime on hand, at least up to Zwei Herz, so I can reference it and be accurate.
2) It's short, and (relatively) light, so it's more in line with what I wanted to do with my Works stories in the first place.
3) Given the possible changes I can bring down on people's heads, this can go off the rails fast.
. . . Before you ask, I figure that Caren will be the one to find him - given that the Church is monitoring the "dimensional cross-rip" zone. Depending on whether or not this universe has a "Caren heals Bazett" event, he may be dealing with her, as well. And given where he is, and who was responsible for sending him there, I'm imagining the presence of a "Kaleidostick Moonstone" - with a seven-pointed star . . .