Well, I finally boiled the tire yesterday and was not able to stretch it enough to get it on the rim. I boiled it for a good 20 minutes before trying to mount it. The way I tried to mount it was to get a portion on the rim and then use large screw drivers to work around the rim stretching the unmounted portion so that it would pop onto the rim. I was never able to get more than 1/3 of the tire on the rim before it started digging into the rim and getting gouged.
Does anyone have any other ideas, or should I bite the bullet and buy a new wheel?