Regulars most likely have the server in the favorites list. Even if they don't it will still show up in the history if changed to custom. People will still find the server.
If it is decided to try adding Pearl Market again, you might also think about adding Propaganda without vehicles. Though this might be overkill.
Maybe try it on the weekend so it can bounce back faster if no one likes it. Or put a vote on the server which map they might like a week before roll out just a thought
still it wouldnt hurt to find out who actually has premium out of the regulars, some people only buy certain expansions only if they like the maps that are in it.