Thanks for posting. That's an impressive tree.
I've tried this once before with similar stock, but I never could get it to back bud on the lower trunk. Always budded at the cut. Even tried pricking the trunk in places and so on.
The only reason I pulled this one is because the old wood had several adventitious buds. Leads me to believe it'll produce sufficient back budding with a hard prune?
When you lifted yours, did you clean all the field soil out of it right away, or did you wait for it to recover and then do it?