I've seen a pic somewhere of a Rocket3 trike that looked, REAL GOOD!
I have a right leg that doesn't work due to a car t-boning me off my new triumph Tiger in 1971.snapped the femur and wrecked the knee in the process.I use a knee brace.Would a knee/leg brace of some sort be any use to you? Just a thought.

The one I use has a steel insert in each side to stabilize and support the knee but there's numerous types.

Dinosaur.

"Oh Man I only ride 'em.I don't know what makes 'em work". Donald "Oddball" Sutherland

"Don't let the bastards get you down". Kris Kristofferson

"I am only paranoid because everyone is against me". Larry [Frank Burns] Linville