This is a problem long since solved by the milking stool
Or indeed by the shooting stick
That said, while looking for pictures of a milking stool, I came across this old article about the original invention which says it was designed for industrial applications, i.e. to make it easier to crouch in certain poses for a longer time without hurting yourself, not for sitting down like you would in a chair. And I can see how it would make a lot of sense there.
