Why are you worried about this? You didn't put this policy it place. You don't have to enforce it. You don't have to pay the fine. Why do you care? Call the game, same as you always have. If a coach or player exhibits behavior worthy of ejection, give them their ejection and move on. The repercussions are their problem.
Do yourself a favor, be the first guy to toss a coach who then has to pay the fine. Word will get around to the other coaches.