I am running into the same issues, I had knee surgery and lost half of my mobility. I have been referred to Cane fu. It has some moves that can be utilized with a w/c if someone needed it. I also started mounted archery. I lost the mobility with my knees but I have compensated by horseback. That is something you might be able to do…you may have to fix up a rig with a saddle, but it is so totally worth it….if you don’t like archery, you can do mounted shooting as well.
I know that isn’t much when you are sitting looking to protect yourself, but it’s an idea you can expand on.