I make that for a work snack on third shift(we don't get real breaks or lunches,and sometimes you just have to quickly eat something in between customers).Melt it all together,freeze on wax paper.Sometimes I put tahini on it, too.
And don't try to convert people to paleo by words/studies/etc. Lead by example. "Eat good, look good, feel good"*. People will/may follow but in any case I presume it will beat any meta analysis on "insert contraversial nutrition topic".
My wife and I do variations on this all the time. We mostly use coconut oil as the fat though instead of butter. Also, I like to add carob sometimes, and I've found that the carob is so much less bitter than cocoa that I don't even need honey. Ergo making the carob variant just that much lower in carbs. As far as calling it "paleo," or not--I don't worry about that because I'm more into pleasing my body's natural needs than catering to my brain's sense of historical aesthetic.