I'd love to see "Fists of Steel".
Quote
According to Shrrgnien, who had Ascûdgamln, they were made by putting the would-be bearer into a 'deep sleep', drilling holes through their finger joints, embedding metal sockets into the holes, and sealing them in place with magic. Then various-sized spikes could be threaded through the sockets. Afterward, the dwarf could remove and replace them by screwing them out.
Replace magic with superglue/divine intervention at will.
It would have a chance of hurting your hands, both at first "fitting" (a whole lot of hurting) and with every strike (a little bit of hurting), but with the advantage of <insert metal> knuckles while keeping full use of your hands (maybe a dex penalty).