Sportsman’s Guide has one I believe in 45lb pull.
There is a device called a draw lock that can be used to pull the bow using both hands, and then shoot the regular way. The draw lock costs a lot of money.
To shoot a deer, the state regs usually require a 40 lb bow.
To pull that bow is like bending over and lifting an 80 lb barbell with both hands in a rowing motion and when the barbell is lifted up to the chest, holding it there for several seconds (aiming the bow). - or doing that same rowing motion with a 40 lb dumbell using one arm.
I have heard of a man who was a proficient classical violinist drawing a bow with his opposite hand - (a violin bow) — He had lost several fingers on his left hand so he had to learn to finger with the right hand and bow with the left. That was quite a switch. He did it though, but never quite as good as before.
It would be a lot easier learning to reverse and draw an archery bow with the off hand than it would to learn to play the violin reversed.
Another cross hander is the brilliant recorder player Benoît Sauvé —although Mr Sauvé learned to play his instrument cross handed as a child and had his instrument made with the holes for a crosshander.
Here’s Sauvé playing a transcription of Blue Train!
http://www.youtube.com/watch?v=zz7LvCS1oXM
This guys bows are actually pretty nice and cost practically nothing to make except for a little effort. He gives step by step instructions for many different types of bows on youtube and has written a book on the subject as well.
bflr
Sammick is a great place to start I have several. With their takedown model you can also buy additional limbs, maybe start at 35 and work up to 45 as the shoulder heals. I’ve had two rotator cup and one torn bicept in the last 10 years and it’s not something that will leave a permanet dis ability. All my Sammicks are 45 to 50 lbs and my Hoyt Compounds are all 60’s. If he’ll just practice he’ll build that shoulder back up.