npub1va…knuu7 on Nostr: As opposed to just making a fresh 2 keys? I mean it'd always be easier to just do ...

As opposed to just making a fresh 2 keys? I mean it'd always be easier to just do that ofc (and authorise new key(s) with old).

Hmm with MuSig2 it's not possible I think. The aggregated pubkey is designed to withstand key subtraction attacks, and that means you can't backsolve to make the aggregated pubkey be equal to the preexisting pubkey.

So you're in a weird area ... try do just combine signatures naively without the protections of musig2 against adversarial behaviour? Very unlikely to make sense since you're doing this for improved security in the first place.