I made one. By luck, all of the music wire I have is just enough oversized that it's a moderate press fit into a hole drilled with a same-size fractional drill (drills always make oversized holes: if you want an exact hole you drill undersized and then ream). So, whack out a bit of bar, make a flat, drill a couple of holes in the top, tappity-tap in some music wire and there you go.
Basically I copied the "Biso Bender" from Harry Higley's, only more crudely. The only real lack with this bender is that there's no bending arm; you just grab the wire and bend, which leaves you with a softer corner on that side than on the side that's in the bender.