At least you'll finally be well-heeled once you get that sorted out.
Time to get rid of the 700 pound bike. There are LOTS of lovely 350-pound bikes, old and new, that will run the highways as fast as you want (or can) go. No need in dreading the next ride, or wondering if your legs will take it.
We live in times when smart people are silenced so that stupid people won't be offended ...