Unable to find eSim provider that would cover Balkan + EU countries

I'm going to Greece, Albania, Montenegro, Serbia, Bulgaria and Turkey (in that order) - total just about a month. I've been unable to find a eSim provider that would cover all these countries as a few in there are not part of the EU. Apart from switching esims everytime I cross borders anyone have some good suggestions on maybe 2 providers that would cover all of these countries?