Disabling generation of certain structures temporarily

I’m in a bit of a tricky situation. I’m trying to stop the generation of certain structures in my world (in this case villages, mansions, and outposts) temporarily and then resume it later.

Reason: I’ve found a wonderful seed for my SMP server and would like to build a handful of custom towns on it in various biomes around spawn. In the chunks I load I’d like to stop the generation of these annoying surface structures. But then once I’m done building, I want to turn on those structures so my players can find them out in the world.

Does anyone have any advice on how this can be done?
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