There are a few of these devices on the market, designed for those with unmanageable fecal incontinence. They are designed for those with an intact rectum. I saw one preliminary study about the feasibility for those with an ileal pouch, but testing had not yet begun on actual j-pouch patients. Here is the link to the abstract on it for those who are curious about it.
https://pubmed.ncbi.nlm.nih.gov/30218632/
The primary issue I see is if you also suffer with anal stricture or fissures, that would be a definite contraindication. Also, if you have pouchitis or cuffitis it probably would be too uncomfortable to retain. That said, for anyone with chronic incontinence issues, even if it is only while sleeping, there would be a lot of motivation to try something like this.
Note, these are medical devices, not something you can buy over the counter. “Butt plugs” that you may see for purchase are sex fetish things that are not for treatment of incontinence, so don’t buy those expecting a solution to your problems!
Jan 