If you are not willing to enforce your own boundaries, then H won't bother either. *IF* you are really unwilling to continue this R without H DOING what you ask (not reading, not understanding, not agreeing, just DOING it), then you should be able to say that in just a few sentences. If you MEAN it, there is no reason to beg and plead and explain and justify. All those things just indicate that you are very unsure about what you're saying, that this is a debate, that counter arguments could easily change the conclusion. If you have a boundary, it is your job to take it seriously and enforce it with your own choices and behavior. (You can't make H do anything, though you can kindly, simply, and clearly inform him of your boundary.)
If this is not, in fact, a deal-breaker for you (and your past behavior indicates that it has not been a deal-breaker in the past), then Nevanna's advice is the way to go.
