I think the only way to even partly achieve that would be to ban more than 2 players in the tackle. Otherwise how do you judge? Players are coached to let the attacking player make short yards after impact, but slow them down as they do it, and ideally flip them on their back to slow the PTB further. Judging when a tackle is complete is difficult when they do that - the only way I can see it is to reduce the strength advantage of multiple tacklers.
Reducing the number of teams is a really bad idea. There's not enough variation as it is. I'd forget these weekends off for the cup except the final as well, the season is far too disjointed.
Just my view, but I think for the good of the sport the SL teams need to be in the CC earlier, and maybe even try to fix the draw to make them play lower league sides (seeded draw maybe). The cup isn't worth squat as it is, and it would give lower league fans a chance to see SL sides, or visit SL grounds. Wouldn't people rather have a cup tie at Whitehaven or have Dewsbury visit than yet another game against a SL side?
Who knows, we might even win a game.....