How about using a piece of tubing (or pipe) of the correct size (just a touch larger than the ID of the bushing and larger on the inside than the driveshaft) and cut some threads on it that you can screw into the bushing? Think hollow tap or screw extractor. It would destroy the bushing, but you should be able to use it to screw into the bushing and then pull the whole works out. That might be easier to fab up that to modify the puller you have.
