Resin can be (or at least seem) stronger than the stuff it comes from, anyone who's smoked resin from good shit can tell you that. And resin has already been heat activated as is required to get the most out of edibles, so your friend has to be right, it could only work and work well if you use enough of it and if it came from good smoke.
Sort of nasty yes, but I think what he's suggesting doesn't involve chewing it up just covering a resin ball in pb and swallowing it whole.
I don't know about that, but I can certainly see trying it in capsules. I wouldn't use bong resin, but for damn sure my stomach has seen a whole lot worse than pipe resin and so have all of yours. Tar in your stomach or whatever is nothing like it in your lungs, big flipping deal. As long as it's not bong resin and as long as you don't have to chew or taste it I see no problem with the idea.