There used to be an ex player in the same bunker as a ref a few years ago, it slowed down the decisions whilst they debated and in the end they often didn't agree, which means the refs decision carried. Jammer's concept of 3, not in the same room, removes the time delay (no debate) and the simple 2 out of 3 carries the decision. An ex player (not from the teams playing) and an ex coach (also not from the teams playing) plus a current ref seems like a decent place to start. It would definitely remove some of the howlers we have seen recently.
Always a Bulldog