When securing my bike (cb500) to a trailer, I once noticed that when on the center stand, you can apply enough pressure to the rear grab rail so that the front end lifts off of the ground.
If you don't have any over head hooks or rafters, you could possibly attach one end of a ratchet strap to a low place on the floor (around a low work bench leg, under a very heavy appliance) with the opposite end of the strap on your rear rail. The center stand will act as a fulcrum, and the front end should lift a couple inches - enough to be able to work.
Good luck!