Give the coaches 3 challenges a game, + 1 extra for OT in the playoffs, where they can challenge anything in the rulebook. All reviews done by the war room, not the refs on the ice.
If a coach gets a challenge wrong they get a 2 minute delay of game penalty, 3rd wrong challenge in a game is a double minor.
If a coach wins 3 challenges in one game it triggers a review of the on ice officals.
I highly doubt this system would get abused since there are consequences for being wrong. No coach is going to challenge a 1mm offside if it's likely they'll not only have the goal against but also be giving up a PP. I'd rather have a couple of quick stoppages per game if it means getting the calls right.
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