Aw heck! Just throw two creepers under it and live with it!

Merlin, what about laying it up on one side? I'm sure the packing materials said "This Side Up", but I don't imagine that (gingerly) turning it up on one side would break anything you haven't already been able to break with the amount of impact it must have taken to break the wheel.

If turning it on it's side bugs you, you might summon up the manpower to lift it up onto a piece of plywood (cut to size) with 6 or eight upside-down plastic milkcrates underneath it. (Make sure the crates are new, and not brittled from exposure to the elements.) Leave the corner with the wheel hanging off a little and work on your back.

If that's too much work just tilt it up against a wall, and work from there while someone "spots you". If you DO this, I would go to the trouble of fabricating a STURDY wooden wedge-shaped prop to keep it from slamming your head. (Although you could probably get away with doing a quick damage-assessment with only a couple of milk crates or something to save you.)

NO! Wait! You're Merlin! Just summon the Dragon! He'll fix it.