He should switch up to the left-handed bow, IMHO. If his alignment is off, he will not be as accurate as he can be. That is why it is very important for beginners to learn which eye-dominance they have, and get setup accordingly. Proper alignment is critical to good form and shooting.

I know guys that have had to switch over to left-hand because of injury or some other issue, and it doesn't take long to learn. He must have patience, that is the toughest part. Ask Field 14 more about the switching subject, he has had to switch from right to left in the past couple of years, and he is shooting quite well again. Just my own thoughts, Pinwheel 12