My wife plays bowls and she told me some while ago that the majority of the old people “pass wind” when they bend down to bowl the ball or wood as it used to be called.
I came up with the idea of a little hollow “T” piece where the base of the “T” could be inserted into the rectum allowing gas to escape without the embarrassing rasping noise. The two shoulders would fit snugly into the crack and stop the devise from being lost forever.
They would have to be a “use one time” disposable item and to stop insects from making an entrance I guess that they could have a small amount of foam fitted inside the T.