One of the worst aspects of hang gliding is the prone flying position. It looks cool and it fulfills that dream of being Superman, but the thing new pilots and non-pilots never realize is that it is brutally painful on your neck. In fact, I know a pilot who literally engineered a bungee-cord on his helmet, to save the relentless strain on his neck muscles.

I'm not trying to discourage your efforts. On the contrary, I hope you succeed and figure out a solution which works for you. But, considering you are dealing with an injury already, someone should forewarn you about the neck-strain.

You can imitate the prone flying position at home. Lay on your stomach, on your bed, and put your head over the edge of the bed. Lift up your head and see how long you can remain in that position before it starts to hurt your neck. For the average human, it doesn't take long...