Do you have one of these?
http://www.handsontools.com/store/sh...uct_id=6043724
Since you apparently have the "longer shaft" (1995-later models, or just a rumor) you need the "PV" suffix version of this tool.
This one might be the same:
http://www.etoolcart.com/browseprodu...er-T-1001.HTML
Judging by the size of the puller screw, it appears you may have space to accomplish it without an R&R of the trans. That would be worth the forty bucks alone.
If you are pursuasive, you might even be able to borrow/rent one from your local Isuzu/Honda/BMW/GM dealer for your Hydramatic. Good luck. It might be worth throwing a few bucks in refreshment money at the Techs to be able to "look at one" for about an hour.