I am near Kitchener Ontario Canada.

I have two swag lamp hooks in my ceiling. I have an either inch braided nylon cord with a loop at each end. I have a shorter cord also with a loop at each end. The longer cord goes over the swag hook and then a loop is place on each brake lever. One end of the shorter cord is place over the other swag hook and the other loop is place over the rear of my saddle. The cords have been adjusted so that the drive train of the bike is nearly at eye level. That's how I do most of the work on any of my bicycles or other bicycles I fix for people.

If it were me, I'd remove the rear derailleur from the frame but without disconnecting the cable. Then I'd lay a straightedge vertically along the derialleur hanger. If the derailleur hanger is bent that'll show that it is.

If the bicycle is supported somehow with the rear wheel off the ground then it's much easier to see if the wheel is bent, how much it's bent, and if working on it, how any work is affecting the wheel.

The reason I asked where in Ontario you are is because I thought that perhaps we could meet up somewhere and I'd take a look at the wheel for you.

Good luck and cheers.