Hello,
What you could research is "revision" surgery. Once a stoma prolapses, it's hard to fix without surgery.
I have a permanent colostomy with an oblong stoma, 57mm at its widest point, the maximum of my Hollister wafer. The stoma sticks out 1 to 2 inches depending on its activity. I also have a peristomal hernia. So... the whole thing sticks out quite a bit. I have no leak trouble, and the hernia is stable.
If I wanted to potentially improve the appearance, I would need surgical hernia repair with stoma revision.
In your case, you need revision surgery. If no colorectal surgeons are in your area, you're going to have to temporarily relocate or commute to a city that has these specialists.
This is the reason I remain in Southern California after retirement. Hoag Hospital in Newport Beach is a 10-minute drive from my home. I've had work friends retire, then "sell everything," leave crazy California, and move to a small city in another state. I warned them... what if you suffer a major medical mishap requiring advanced care?
This did happen. My retired friend suffered a mild heart attack while working in his garden. He was transported to the local medical clinic that had no advanced cardiac care. They made him comfortable. Then he was taken to the nearest bigger city. They didn't have advanced cardiac care either. A few days later, he was flown via life flight helicopter to a large hospital. But too much time had passed, he was very weak... and died. Age 64. He was only retired for 6 months. His widow at the funeral told me he might have survived had he received appropriate care right away.
Best of luck