Hi, having relatively recently become a left leg below knee (LBKA) I have discovered I reluctantly have to make some modifications to my Road King so that I can continue to ride again. 

Hi mate, I have a small Indy workshop and recently did a project for a guy with a similar disability. I transferred the shift set up to the right side of the bike, installed an electric push button shifter, a retainer on the LHS floorboard to stop his foot sliding off and a kick stand extension...which to answer your question was just a simple bolt on piece of aluminum custom fitted and bent for his best access. Theres no issue with him walking the bike backwards. Sorry I cant be more helpful.

have  a  look at "SO baggers electric centre stand one year review" for hd baggers on you tube.

Used to see a fella  around a fair bit a few years ago ,  he had one arm , was behind him once on the yankallia to  Delamere road , , certainly did'nt slow him down

Thanks @ratpick,