One thing to look at are the local "Adaptive Services".
Both Eugene and Portland have something. Are parts of California enlightened too?
https://www.eugene-or.gov/134/Adaptive
https://www.portlandoregon.gov/transportation/73371
adaptivebiketown
I think at least the Portland system is very much modeled on their Bikeshare program, which very much doesn't apply to some bike commuters and Living Car Free individuals.
In your case, you really need a long-term rental for a few months, then hopefully your needs will go away or evolve.
But, I have no doubt they would be a good resource to stop by and talk to.
Find out what you have locally for Adaptive Cycling.