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If it's attached to the campaign and the players subscribed, it should still work.
If they hadn't downloaded the map yet then that would indeed make it not work.
Sorry about that... it was bound to happen by switching to a master file.
Subscribing to the big mod will give them access to all areas. You'd just have to redecorate and prepare in GM mode.
Search for Ashan (Maps, NPCs, and more!) to get everything!