Not so much the game as such (really, any system would work), but much more the setting.

There is an archive of the playtest (I still need to write up the final scenes). But I think far more interesting and important is the service that came out of it.

I do like the living in UU link you provided; thanks for that! On a related note, I was very impressed by the historical novel The Last Witchfinder which has UU related people and responses, but is subtle about it. It even includes a group study guide.