Looking for assistance/advice on setting up left hand only controls- specifically brakes. It's easy enough with cable actuation but how does one rig it with hydraulic? I imagine some proportioning or front/back bias adjust will be necessary? Any help on suppliers, parts, homebuilt solutions greatly appreciated.
I knew a guy who lost his left leg and wanted to keep riding motocross. He moved his shifter to the right side (don't ask how - it's complicated,) then added another brake perch, master cylinder and lever to the right hand for the rear brake. He would operate each brake independently with a different finger.
You may be able to do the same (except on the left side) for both your brakes and thus retain independent braking for the wheels. My friend had to run a longer lever on one perch to make up for the added spacing on his handlebar. I bet it will be far easier on a mountain bike, without the throttle housing to get in the way. (Doubly so since the master cylinders are far smaller and more built-in on the MTB-focused products.)
Whatever you choose, good luck. Kudos to you for riding despite your handicap!
Hope make exactly what you're after - https://www.hopetech.com/products/brakes/cross-country/tech-3-x2-uno/ I wonder if you could get just the adapter hose thing to use with any brakes.