The recipe is tried and true. (I find it easy to trust a recipe from a chef who weighs 600lbs.) I was just thinking of replacing some of the cayenne with maybe some scotch bonnet or ajis.
Do it! To me, cayenne provides a little heat, but it has no personality. Some of the citrus flavor profiles of the other peppers could help enhance the other flavors. Most people around here put plain old hot sauce on their red beans, but in my experience, nothing compliments red beans like habanero cooked in.