It is done! In the end I had to cut the tire and tube off then drive
the wheel halves apart. The issue was corrosion in between the wheel
halves. I had gotten them to rotate very slightly by tapping with a
hammer and block, but not enough to get them loose enough to pull
apart. Interestingly, the old tire had a mold date of 72 and the old
tube was stamped January 73. I think it is very possible that this
PIK has never had a tire change.

All is right with the world again. Thank you everybody for the
advice!

TJ