Update: I only lasted 9 days till frustration and boredom overcame common sense and I went for a short ride. Got out the XR650L on Saturday, put a Throttle Rocker on the right grip, and rode to a friend's party 15 miles away and back. It worked out fine -- I could actually control the throttle and front brakes very well. The only problem was operating the clutch -- my left hand is still weak, and I can't use my middle finger, so I had to adopt more of a full-arm motion for pulling in the clutch lever.
But it was just too damn nice out on Saturday, and I was too pissed off at being cooped up inside. No, this won't be a regular occurrence -- I want to heal properly -- but mental health is important too.