Well.. I think you answered your own question.. right here..
"I’m open to sending an olive branch, but not if it’s not going to be received well and I just don’t know if it’s been enough time for H to have ‘licked his wounds’, so to say. I have no intention of walking back in to his life at this conjuncture, no. Not without some serious commitments (and a little head examining- as one of my friends would say. The Proctologist called. They found your H's head...)."
From the way he responded last time.. I have to assume.. he will respond the same way.
I know you WA.. I think it may have been a smart thing to do. From his reaction.. and your description of it.. he is in "Protect Mode". He has been here before.. and everything that happened then.. is going to be twice as "rigid".
I personally.. just being a man.. hate notes.. email.. txt messages.. or anything non-personal when it comes to getting things done. I hope you understand what I am saying there.
The thing you are afraid of.. will likely bring about the best result. I you think you "could" be up for calling him.. I can help you with that.
Relax Eat Think Act normal React.. Smartly. Do something different. Emulate. Do Work.