Can see it being really difficult, works when there are ball boys to put balls on cones but you won't have an army of these (if any).
Whenever I was AR1 at clubs with athletic tracks I always had to work really hard as they really tried to exploit it. If they were losing or drawing they'd constantly try to chuck a new ball on even though the referee hadn't asked for one. As soon as they went ahead the ball bag mysteriously disappeared and you'd have more chance of finding an honest MP than a football. I had to get the referee over several times, especially at one particular club who were notorious for it, used to cause major arguments with the away teams.