need help removing KH pistons

Drill & tap the end of a 3/8-24 bolt & screw in a 1/4-28 grease fitting.Screw this into the caliper body just snugging it down.
Plug the other hole(s) with bleeder screw(s), attach a hand gun, and pump away. If one moves and the other one doesn't, which it probably will, clean it up, reinstall & clamp it, then pump the other one out. Messy, but effective!