OP needs one of these. One of a kind afaik.
TBH, I've done bananas, and they're too irritating. Bananas are almost entirely fiber, which although your butt is designed to pass, is like really fine sandpaper. Same with oatmeal, there are solid, scratchy plant parts inside it that are normally more thoroughly "softened" by the process of digestion. In the future I'm going to stick with mashed potatoes.