"Ladies and Gentlemen... We have a winner...!" (with honorable mention to Tnom)
I did not have any beeswax handy, but did have some candle wax.
Before describing my experience, I will admit that I thought it unlikely that either technique would work because it seemed to me that the melted wax would be far too viscous to penetrate, and I had no luck with (what I thought were "proper" penetrants.)
So, this morning, with a candle in hand, I approached the beast, lit my torch, heated the yoke slightly, and dabbed on the wax, both in front of, and behind the yoke.
I then intended to hammer the yoke back on, but because of the odd shape have to be very cautious to locate the blows properly. The first few stroked were very light taps rather than the firm strikes I expected to need.
Tap tap tap and the damn thing move... visibly.
Next, I grabbed my prybar and the spacer that allowed it to work. I expected to have to lean into it as I had, but as I got it into position just its weight and its wedging action moved the thing slightly.
I gave a pull, and it moved about 3/4"... Another pull, and it was in my hand.
I was truly astounded, and most appreciative.
I've been around tools for fifty years, and had not heard of this wax trick before.
Sincere thanks for all the help,