I think we need to be realistic, hwbot is a dead end when it comes to change. 95% of the value of hwbot is the database of old scores and the ability to compete and rank your scores against the same hw. Most of the database consist of scores on old Windows versions and/or old and unsecure benchmarks.
You can never force benchmate on the ones benching for hw-points without resetting all the scores. I don't see that ever happening.
As you said, implementing benchmate on hwbot in a proper way would also require alot of work from hwbot's side. I don't see that happening either.
The way benchmate can be used is for new hw and world records (globals). This can be reset in a day as there is no database to speak of. But there is still the part of getting proper integration with hwbot. Good luck with that! My suggestion to mat is if you ever want to see your great softare get any proper use you will have to do everything yourself and most likely set up your own site.