In the future this could be managed by using the shared realms ability.
So just like when you are able to purchase or download a shared realm, and then make local changes, and then resync to include changes from the shared realm when changes are made to it. (All your local changes would remain local to your GM realm.)
The shared realm in your case could be the generic world information.
Your local changes would then be the GM stuff that is specific to your plots (so other GM-players won't be able to see your plot).
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