Yea not sure what to do about NIP-07, i can store the pubkey but if you are using NIP-07 with Alby for example you have to change the account before it will let you post for that pubkey.

Any suggestions? Maybe it would be good to have an endpoint to list accounts and select account?

Not sure what discussions have happened so far with this.

Ofc if you the nsec then its not a problem and you can shitpost on alt accounts easily.

Alternately this could be a delegated key session, my NIP-26 branch is in progress