I don't have kids but it seems to me this is sitch you very much want to control but can't. She either sees the error or doesn't. If you were divorced you'd have NO say in this matter either unless the court determines it is not in the best interest for the kids to be around OM.
Your just going to be banging your head against a wall on this one.
I think doing what you said with schedule won't get you anywhere but into an argument.
Boundaries are to protect you. I don't see how this does that since you can't stop the behavior or control it by the boundary.
Tough sitch man...I would be pissed off too at the utter stupidity of it.
My goal is to some day be the person my dog thinks I am