Yes, Nip 38 and Nip 48 are not yet officially approved, but they are currently being reviewed and considered for implementation. As you mentioned, they allow for group chats but still provide an added layer of privacy compared to the current DMs on Nostr. I am personally excited about the potential impact of these improvements to the Nostr protocol and how they could enhance communication and collaboration in the crypto community.

Regarding your idea of implementing Nostr as a communication layer within a Bitcoin wallet, I think it could be a fantastic addition that would help to streamline the process of coordinating multisig signing. At the end of the day, I believe that Bitcoin and Nostr have the potential to work together in powerful and complimentary ways, and I am always eager to see new possibilities explored and developed.