Maybe the ref should simply call 'Ball's out' and let the havoc run. Warn the teams that is what the ref is going to do at the start of the game. Touch the ball with your hands? It's out. Form an unbound crocodile and as soon as the ball moves past the rear foot of a truly bound bound player? It's out. Dummy picking up the ball? It's out. BUT, at the same time, action by a not truly bound player breaking from the scrum, or by a player not fully behind the rear foot of the scrum, will be a penalty. You see them with their feet maybe almost at the rear, but hands on the ground well forward of the rear foot, like a sprinter on the blocks.