Dude, there are some Brazilians who implemented this idea and created multisig contracts on Nostr. Check out their project; I think someone will soon improve the user experience. It’s worth keeping an eye on their work!

@`npub1p79dx59d5gctllar73cqnucqft89gpkfmydxj4mmk2jj69s7hn3sfjatxx`