You can do vanity npubs for corps in a FROST design where they can swap keys as needed without changing the npub. Key discovery/completion goes through the user's WOT graph.
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In my understanding, FROST can't help you here, because the new owner has no way to confirm the previous owner deleted their key shares. I could be wrong, would love to be surprised. Ed25519 too can do FROST so that will be good news.
They don't need to delete. You just rotate the polynomial to a position the leaked key is not part of the polynomial anymore.