I think relays could set sat required policies for broadcasting certain kinds. So is possible but onpy as far as you interact with relays with the policy. I dont think thats feasible for an npub to require that policy, just not how nostr works from my understanding.
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It might work with a new NIP that only displayed the contents (or even existence) of a DM if a successful zap were attached to it, but of course, it would not be backward-compatible. That’s as far as I can go with this idea right now.