Heck, all this tomfoolery; I've forgotten what AJs problem was.
Farked up right wrist?
Easy day. You will probably remain able to work the throttle grip, but the front brake will be problematic. If you cannot operate the throttle grip, you may be able to rig a thumb-operated throttle, such as those found on snowmobiles, personal watercraft and ATVs.
Check into a linked braking system. It may cost a bit to have one fabricated, but if you find someone handy, they may be able to modify a system from a "donor" bike. Then you will operate both front and rear brakes from the foot brake. Even easier, have the foot brake operate the front brakes only. They are the bigger stopping force anyhow.
As my late Father-In-Law would say, "It ain't no hill for a stepper!"
OR, you could move it all to the left handlebar like my friend Brett Cole has done:
YouTube - one armed motorcycle racer
This Man is an Inspiration to us All. Seriously.
I love Motorcycling. I mean, I really LOVE
Motorcycling - but I can't say with any certainty that I would be able to get back up on a bike after the crash he had.
Brett had his ENTIRE shoulder removed after the crash - what you see as a "shoulder" on him is just muscle-mass the Doctors arranged so it would look more-normal - there are no bones there, nothing that can support a prosthetic, not even a cosmetic one. He's also had to deal with substantial severe "phantom limb" pain.
Within a few weeks of his coming-home, he was already wrenching on some of his bikes (on his own!), and even was straddling, starting, and attempting to find the "friction zone" - all with his left hand. He devised the throttle and brake/clutch on the left side, a few of his other friends helped him to set it up - Dude was a Natural in the saddle before, this hasn't really taken much away from his Moto-talents.
I would not be surprised to see him compete on a Professional level in the next few years.
Brett is 20-years younger than me, but he's one of my personal Heroes.