Sin Bin is a ridiculous idea in football, as soon as a team loses a man to the bin they will time waste for the 10 minute duration, players will go down 'injured' at the slightest contact and the physio will come on for as long as they can possibly stretch it out, GK will take an age with every kick, throw in's the same. The game will have zero entertainment for those 10 minutes.
Stop messing about with the rules and just enforce the existing ones.