That is a neat trick r-dub!

As was stated before using levers to get that last little bit can pinch the tube, then you are back to square 1.

I've wondered wether putting some soap on the rim might help. I've never tried it, but lubing the rim is essential in mounting motorcycle tires which have much stiffer beads and sidewalls. It takes a lot of strength to seat a motorcycle tire, but it also does not require a lever.