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After the 1st Schelswig War I don't think you need Captain Hindsight to realize that the business isn't finished. So I recently learned that upon German advance, the Danish were offering chunks of Southern Schleswig to the Germans.
So, could the Danish preempt the 2nd Schleswig War by offering part of Schleswig to be integrated into the German Confederation (and administered along with Holstein) in exchange for annexing the rest of Schleswig directly to Denmark?
(The partition here is key, I'm not addressing if the succession of Christian IX to the duchies is going to be part of the agreement so this may or may not be in the package.)