I speak from personal knowledge only about Artist Point, California Grill and Flying Fish. The answer was yes. I hear Jiko will allow it also but I don't have personal knowledge of that one.
I was using the 2007 plan and they all permitted ordering cheese selections as either an appetizer or a dessert. I am not sure if they all still do this. At any rate, the appetizer vs. dessert question is now relevant only to those on the deluxe dining plan.