It’s surprising how the threat of mediation will suddenly focus the committee that one is serious.
Tom Cruise as Maverick in Top Gun:
Don’t think, just do.
Just cart them off to mediation, don’t threaten, do it.
It is informal, there is no commitment beyond it, there is no cost and once you have been a few times you will be very relaxed about it and happy to do it every-time the rogues put on another performance as bad actors.
And if your OC is silly enough to get, for mediation, legal advice or send the agent as their rep then that is their choice, not yours. So any vilification that you are costing the OC is easily dispelled as playing the man and not the ball.