Thanks for the background information. Here's a suggestion:
-You conduct some research on solution-based MC therapists in your area and print off their contact info
-You print out info on Retrouville
Sometime next week, you can approach H and say let's work together on finding some common solutions in addressing our marital issues.
Then present him the print outs. Ask open ended questions if he would like to participate by calling Retrouaville himself and making arrangements to attend their sessions.
Then you handle MC appointment. You would want to take care of the MC because of your DB experience here and others can chime here in on what to look for in a MC.
This way, it is a win-win for the two of you in that you are being accountable together in addressing your M issues and working toward a better relationship.
The end result is that you allow H to step up as a partner and feel invested in the process. For sure, it'll help his self-confidence a bit. Try to let H take the lead sometimes here, ok? He will not feel so hopeless seeing this action from you.