Yeah, that would be interesting!

I heard about FROST awhile ago, haven't looked more into it yet:

https://github.com/nickfarrow/frostr

Also want to look more into key invalidation and migration. I have a few ideas, need to flush them put more. Mostly thinking a suggested migration with multiple side-channel methods verify, that would give a user interface to confirm the migration. There vould be helper methods including: verifying with others in follow graph, designated root key/keys and/or NIP-05.