[Editor] Any way to give civs buildings they would normally be forbidden from having?

Alternatively, any way to make civs in the editor "generic" until someone selects one?

I'm trying to do a map, and I need to give keeps to every civ, but it turns out that since certain civs do not have access to keeps, I do not have the option to place keeps for that civilization

note that I am actually going to disable tower building, so which civ gets what tower should be irrelevant. I just don't want the towers to be downgraded if someone selects a civ with no access to keeps