There was a thread over on ADVrider (but I can't find it right now) where somebody used 9 cambuckle straps from Harbor Freight ($1 each) to cinch down around the tire until the beads met. This made it easy to slip both beads onto the rim. Then he loosened the straps and pulled them out. Someone else reported doing the same thing with long zip-ties and getting the same result.
If you go to Home Depot you can find long, heavy duty zip-ties in the electrical department. Haven't tried it myself but it looks like it would work and save some fighting with the tire irons. Of course, there's no substitute for practice when it comes to changing tires.
https://www.st-owners.com/forums/showthread.php?t=33775