Well, it sounds like these might be good served with mashed potatoes. I don't know much about substituting potato starch in the recipe; if I ever make it I'll have to do some research to try to make sure I get ingredients that will work.
As for the cheese, cheddar is my go-to cheese for everything but I could do something different. One note about cheddar: It's naturally white, but often has orange dye added to it, for I-don't-know-what-reason. I might stick to milder cheeses on your recommendation.
