About an hour into a two-minute pedal swap I came to the realization that I had a seized pedal axle. The 8mm allen head on the pedal axle was stripped, my vice grips wouldn’t grab the axle, and I was running out of options. I tried penetrating oil, heat and large blunt objects. Nothing was working.
As a last resort I put the crank arm, pedal axle and attached vice grips in the freezer and went to bed. The next morning the axle came right out. I would not have guessed that freezing a steel axle in an aluminum crank arm would have helped, and it may not have, but in any case the axle is out.