Update:
The rotary expert had me spray the rear stationary gear with PB Blaster, let it sit overnight, then tap it with a hammer to 'wake it up.' Then he stopped by, used two pry bars exactly as described by C. Ludwig and got the thing out like magic. The old o-ring was pretty brittle, and when replacing it we used some Toyota OEM valve cover sealant (similar to black RTV) on groove and the new o-ring.
We reinstalled the transmission last week (plus a new Exedy clutch), the car has logged about 20 leak-free miles so far.
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