Im sorry to here about the accident. I will say I admire your will to keep on keepin on! I do know that Fishpoint, and Harsens Island both have Draw units with handicap Blinds, They also have special dates for hunts as well.
With that note, Do you hunt Point Moullie or that area? If you did you might think about talking with them to set up a special draw unit with an accessible blind.
Finally, Have you looked into a boat with a hunting partner. You should be able to rig some sort of set up up where you can sit and lock in to and then shoot out of no problem. I know it all cost money but Its worth a shot... Let me know if you have any more questions bud and I would be happy to help.