Shared Regions (political proposal)

This time I introduce my idea of shared territories between two or more countries of EU (as you can see some colored countries are not in EU, it means that it is an highly hypothetical case), whatever that's my idea: areas in dark blue should be made "indipendent" by original nations, the new states born will have a government and a parliament, to make autonomous laws, but not a president (I'm basing on a parliamentary republic), this charge belongs to the heads of government of the other involved states, those which "share the region", so that a law, to be approved, must pass under the signature of both (or more) state's head of government who can protect its nation cultural and economic interests

Only some region that came to my mind are displayed on this map, this system might be applied elsewhere there are good relations between bordering states...

more recent version: fav.me/dc13qro