In other words stop the debate at all cost!
They should just limit the debate to yes and no answers, allow the two guys to sit, and end it at the 20-minute point.
At some point, Joe is going to take a swing at someone who challenges his view on things, and try to punch them. At that point, the ‘game’ is ended and journalists will just sit there in silence.
Maybe the convention can invent a way to skip Joe, and find a whole new person out of thin air (like Oprah, or Beto).