My thoughts are like Simple Nature's, only I'd probably try thin leather (bar tape? old wallet or purse?) glued onto the bars with Barge Cement where the Minoura clamps. Or even just metal-to-metal.
Also, for the tripod threads, blue LocTite 242. Even red perma-locker could work if that joint doesn't need to be disconnected. (dang, the price of that stuff has sure gone up)
But I hear you K'Tesh, it's surprising that GoPro doesn't offer a ready-made quick-disconnect mount for bikes with the features you mentioned. Seems like an obvious niche to me.
Last edited by Alan; 01-31-2013 at 08:07 PM.