You can easily re-roll usernames in Signal, and profiles in SimpleX. I couldn’t find an equivalent feature in Session.

Maybe, but if you’re burning codes in this scenario, you’ve got bigger problems to solve.

Create a secret passphrase - that only your family knows - that can be used to verbally verify it’s the real you and not a scam caller. Bonus points: create an alternate passphrase that can be used to signal that you’re under duress.