First class support for XPub exchange should be a Nip imo. Then multiple applications could inter-op for multisig use cases.
Okay, well since you have the experience, would you like to be the one who submits the NIP to the nostr repo?
https://github.com/nostr-protocol/nips
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I would love too but I’m not sure I will find the time to see it through. Best would probably be a collaboration as co-author. If there is someone else you know of interested in this topic please connect!