For about $400 you could set it up like a Tuono. My bike came like that and I loved it, as my arm would go numb, and my back would hurt on a sports bike. I figured I was just getting too old for that position. After getting frustrated at the track, I started lifting dumbells, and riding my Mtn. bike up some steep rides, nothing drastic at all. Now it doesn't bother me in the slightest, and my knees don't hurt anymore, so I went back to the clip-ons.
I don't know how severe your injury is, but like budoka said, it might be worth a try.
For an upright conversion you need:
A used, or a chinese cowl and windscreen to cut for bar clearance
Aftermarket upper triple clamp for supermoto bars
Longer brake and clutch lines
Supermoto bars of your choice
Bar end mirrors
Makes a wicked upright bike!