A professional foul is already a red.
Dissent should simply be a mandatory yellow, EVERY time. Only the captain should be allowed to speak to the referee. Apply this properly and consistently, and you solve the problem. Eventually the message will sink in, even with these thicko bleach-blonde...
Its a stupid idea. Sin-binned teams will just go into parking the bus till they get their player back, which is hardly going to improve the spectacle for anyone.
Plus it'll only cause more injuries, as the guy left kicking his heels is left cold from the game before coming back on. Get ready...