Maybe your H is like me and more avoidant in nature, which would mean, he may never really open up like you. It's so difficult for people like me. Even with T, who I really trusted more than anyone, I barely spoke about childhood, and it wasn't any reason other than not wanting to go down that path. So I can understand him if he is avoidant

Another thing is, ask him if he is open to it and he can pick whomever. Maybe a woman would be better for him as far as feeling more open to doing it. I would suggest telling him how important trying again is to you and asking if he is willing and how you can let him choose or something.

I like EM idea as well as asking T for a referral. MC would really help you I think though if H can agree.