While I actually agree with you on Germany, if you don't want to 'slice it', as previously stated Germany and the Ottomans already share a maintenance reduction. I would presume, then, that you would be in favor of switching another of them to something different?
I would really like a Realpolitik UA for Germany, particularly since it's Bismarck... I mean, Bismarck as the Leader ties into neither the UA nor either UU...
Something like...
'Double all Diplomatic bonuses and penalties with other Civilizations. Gain an extra Tenet about gaining an Ideology.'
(Of course, making them more polarizing in Diplomacy is almost the opposite of realpolitik, is it not?)