V
VCRW
Lurker
I'd rather not get back into line passes that are really confusing to the players. How about making it simple, once the offensive team enters the zone, the next time the puck crosses the blue line out it can only be played (first touch) by the defending team. Think of the cherry picking opportunities (caveat being the goalie can freely play it if they shoot it all the way down).
Players adapted to the 2-line pass rule for years. I think they could easily handle 5 minutes of 3 on 3 with such clear vision of the ice surface.