How is your default scenario saved? through tags? In that case you probably will spend a good time trying to save it. I don't know how unity works but maybe you can use a File writer class that writes the province (ID?) and the country created when the scenario is saved and a file reader class that just reads the scenario to load it.
Yea it's saved with each province having right now around 4 or 5 diffrent tags saying what culture it is, province, country and more.
i could prob make a code that saves all edited provinces in a list and then another that places the new tags out again. just gatta find time and figure out how exactly to do it