This might be too simple, but what about strapping weight to the front?
How about a block and tackle or come-along and raise the rear from above? Put a couple of jack stands under the crash bars and find a hook point on the back.
Mostly just thinking out loud, but as an old (or not so old, I know you are younger then me) farm hand, you ought to be able to figure out a way to lift the rear. If you remove the back half of the rear fender, you need to raise the rear wheel only about an inch off the ground.
Use a sky hook if necessary

Good luck.