I wish this guy was my H's IC. If he was, we may not be in the situation we're in.
Why did you end MC? If H sees all counseling as working on a relationship he might be done with, he may refuse even though it could help with the separation. I don't know your H, so I can't guess. I'd try to make the note more friendly and less formal somehow. Would it be easier to say this on phone in a friendly way or do you think he would respond better by email after having time to think about it?