I love these, especially 4! This could prevent weird map situations and also without that it would feel way too much like KoH1. It would be a cool way to carve large enemy empire without over extending your own borders. In KoH1 I have always had a problem with large enemies that just don't want to give up even tho I took all their strongest cities and only way is to conquer them entirely!
I also hope they add some provinces like those! Even Aegean Islands could be their own province (for the Duchy of Naxos) and fix some provinces borders like Papal States that what I saw don't look like what they looked like, in fact KoH1 is more accurate with the shape.