Press the axle out of the bearing (or axle and bearing out of the cup - doesn't matter which). If you don't have access to a press just support the NDS shell on a wood block with a through hole, and pound on the axle from the drive side with a large hammer. Then you can put a large bolt through the hole and screw its nut on tight - tightening the nut/bolt will loosen the left-handed cup.
Alternatively weld the axle to the cup, and use a steel crank to turn the axle.