I'll use what these guys did https://formstr.app/
with two more kinds to handle other things.
i think this can be done on launch as well (launch of the playtest system, not the launch of the store).
it'll be unreliable at a certain percentage of course, that's just the nature of nostr, however, down the line an aggregator events db (like on deg mods) would be developed/setup to mitigate this.