I had/have the same issue.
A few tricks I have learned, after destroying a rim:
1) Push bead of mounted side to middle of the rim, can take off just enough pressure to make it easier to mount. I know you don't have heds but this video explains it well
https://www.youtube.com/watch?v=h-XFMGDO2rA
2) Soapy water as a lube on the bead once you have it mounted will help the tire seat. I now have a little package of hand soap in my tool bag in case I need to make a change on the road.