I'm about due for a rear tire change, so might give that combination of garbage bag, tire warming, and zip ties a try to see if it will get the tire on without spoons. I think the spoons will still be necessary for tire removal, so it might not eliminate any tools, just make it easier to mount and less prone to pinching the tube. I have access to a proper tire changer right now, so if I don't try the garbage bag trick it's because the ease of that tool was too tempting