I was inspired by the Cultural Buildings Persist mod, which doesn't exactly do what the name suggests. So I made my own.
You can build cultural buildings according to your own culture or the province culture (or both!). Also, no cultural buildings should be destroyed when either culture changes. I think that will apply to buildings in holdings acquired via war, etc., but haven't had time to test it.
Steam Workshop page: http://steamcommunity.com/sharedfiles/filedetails/?id=458477090
You can build cultural buildings according to your own culture or the province culture (or both!). Also, no cultural buildings should be destroyed when either culture changes. I think that will apply to buildings in holdings acquired via war, etc., but haven't had time to test it.
Steam Workshop page: http://steamcommunity.com/sharedfiles/filedetails/?id=458477090