That sounds like it would run into the issue the auction house has, where it can’t be used outside of public zones because of some database download thing I don’t fully understand; basically, a map instance has to download a whole thing the first time any player opens the auction house in it. Once it’s downloaded, though, it’s good to go for any player that wants it in the future. This is fine for any map instance that’s essentially permanent like city zones, but allowing it in zones that get closed after use like mission maps or bases would tank the servers, so the /ah command is disallowed there. My point is, convert previews might run into the same issue, so converting might become only possible in public zones.