I dont know much about VBCW concept, but as a Dane this sound interesting.
Lets say civil war had started, i think that Sønder Jylland (Northern Schleswig) which is the Danish name for the border region, would be a interesting area.
I dont think we would have the power to fight a 2nd "1864" war. During the great war Denmark remained neutral, but the Danish military was still weak, because we didnt wanted to upset Germany. At the moment it was almost only a border security force.
But maybe a civil war vith the local voting areas as a center, could be a possibility?
But in Northern Schleswig both then and now there is some German minorities. In 1920 a lot of the men in the area vould be veterans who had fought in the great war. Some would be German minorities who of course voted against a reunion with Denmark.
Both germany and Denmark had a very agressive election campaign. And minorities on both sides after the reunion, would not accept the results.
As far as i know there were areas like the town of Tønder who had around 90% support in favor of Germany. But since it was in a local region which votes in favor of Denmark Tønder ended being Danish.
The link shows how the votings vent blue is in favor of Denmark and purple in favor of Germany
http://da.wikipedia.org/wiki/Fil:Abstimmung-schleswig-1920.pngThen of course there could be communist supporters, Conservatives and Nationalist etc. in the rest of the country. Who would use the easter crisis situation to their own good.