about Germany in the borders of the Weimar Republic,
I read it in a speech of Schumacher once, during his lifetime, no German party officially gave up the regions east of the Oder.
The Kommunists were the first to do so in 1953, when East Germany recognised the border.
Splitting the Christian Democrats isn't easy.
It could only work, if, for some weird reason (somebody might start screeming ASB) the Eastern CDU is left alone after Kaiser becomes chairman. It was well on its way to take the place of the no longer existing Social Democrats under Kaiser in OTL.
With a strong base in the (protestant) East confronting Adenauers strongholds in the Rhineland and other catholic areas it might work.
This, of course, works fine with the original idea of this thread.
The other problem is, Schumacher would have never ever accepted a demilitariesed germany on the long run, since it would have meant a limitation on national souveranity.