Oh heck, why did you have to make it more complicated?
Complicated?
Hohenzollern is the grey bits, including the bits that aren't connected to the other grey bits, like the grey bit near Lindau, which is surrounded by Württemberg and Bavaria, and a couple of hundred KM from the other grey bits, but not including the yellow bit in the middle of the main grey bit by Magerkingen: that belongs to Württemberg.
See? Perfectly simple.
Also, the state was offered to Prussia because the nephews/cousins/uncles/all of the above of the king of Prussia abdicated. This territory was and to some extent still is a splatter of lumpy hills, and while very pretty, it is rather hard to get to or travel around, with about three fields that were not at forty-five degrees. Because of this The king said no, until someone pointed out that if Prussia didn't take it, Württemberg would get it, and well, obviously that couldn't be allowed to happen...
In the World of Ascension Hohenzollern is independent again, and their chief Export is the mercenary Hohenzollern guard*. This is based in Igelsweiss, which is a tiny exclave in Baden. As the
Igel is German for a hedgehog, the Hedgehog is the logo of the guard, and of course it means that in any game when the Hohenzollern guard arrives I can use the Call sign "
The Igel has landed"
I'm easily amused...
*
Again, all characters are based on real people.