Speaking from my experience, if you don’t have excessive stool and gas escaping, I would keep it like it is. The revisions can sometimes result in valves that don’t work properly. There may be way to dilate the stoma with leaving larger catheter’s in for a week or two. The folks with a BCIR use something they call a binky. It’s like a pacifier that you leave in your stoma like overnight etc. you can graduate to a larger size. To keep it from shrinking. As long as it’s okay with doctor, it may be worth a try.