I think I like your approach and thoughts on what to say for MC. Just making it clear you are there to identify solutions. That sounds good, and I don't think it invalidates your H's experience of wanting to go. That's all I would warn about - be careful you don't make him think you don't believe in it, or that you think it's dumb or a waste of time. That would be damaging, he needs to feel you hear him when he mentions this.
Last night I was talking with my BFF and she and her partner go to couples therapy somewhat regularly. They'll go every week a few times, then every other week, then maybe every third week. Then it tapers further for a while. Then there might be some maintenance sessions. Then maybe another time of needing to go back to full time.
For her it really helps in bringing them closer. But this is a long term priority for them. They're not reeling from an A. But I just wanted to say that for some with the right counselor MC really works. But both partners have to be invested.
I hear your hesitancy, and I think it's fine to start that way. But if this continues longer term you're going to have to also let your guard down and it won't be just talking about your H. I'm curious how this goes for you.