Great idea! I think this is a good middleground approach. Relying on paramterized replaceable events seems a bit fickle. It works well for nip23 long-form events but even then clients are taking a long time to implement it and I know a lot of relay runners don't like/support replaceable events.

Since currently a user already has to resign on an edit of a crossposted item the UX should be the same if we have worker broadcast it after edit window.

One thing we would want to consider is what to show in item-info for a crossposted item DURING the edit window. Currently it will either show crosspost to nostr or nostr note