Congrats on making it through the rat maze!

+1 on the kit weight, especially with out the shelter/sleeping items.

A Co-Motion Americano Co-Pilot Rohloff could be done. Depending on your needs/desires, you may or may not want disc brakes (NOT trying to start a flame-fest). If not, a custom one would need to be done.

Peter White Cycles has a real nice section on lighting on his website including actual samples of light beams.

While I know very little about them, you might research recumbent trikes due to your back problems. Greenspeed supposedly makes really nice ones.

Wishing you wonderful tours!