In my last game, I unified HRE as Austria around 1586. Could make this about 10-15 years earlier without 6th and 7th general reforms - but that's more of a noob trap. Anyway, I used to no-cb all nations that gone protestant/reformed, and most of them were free cities, which also drain my relations with HRE princes. Is there any way to actually get a cb on those you can't reach directly like Ditchmarchen?