I agree with Old Hippie. I have an old Luminox that I wore when I was in the field (electrician). The only metal is the crown and clasp. I took a short length of #12AWG wire, which is made up of many finer strands, and curled the wire to create a base/pedestal, stripped off about 1/2" of insulation, and separated the strands into, sort-of the spokes of a half-opened umbrella, sort of V shaped. I placed each hand on a strand, manipulated until I had the hands with the visible faces upright and horizontal, placed on a piece of large newspaper, and hit the gold hands with black spraypaint with very light, quick swipes. Repeated until the hands were colored, and voila. Didn't even have to broach the holes. A look at the watch now, you'd never know the hands didn't come black.
Don't see why you couldn't do the same.