I'm thinking about developing kata series for hypermobile and Dysautonomia people once I get to shodan level (black belt). I couldn't do any such thing before then, out of respect to the practice and to safety itself. But it would be interesting.
I believe you're not even authorized to be a Sensei until you achieve at least Yon-dan level, fourth degree black belt, in Goju Ryu. I could be wrong.
The purpose of the kata would be to do as much damage as possible with the upper body, while posturing the lower body such that it would have as few dislocations as possible, such that one could run away. Kicks may push more force through an opponent but the risk of dislocation and landing improperly is high.
One thing I treasure about the Goju Ryu style is that one of its tenets is to close in on the opponent. This significantly reduces dislocation risk. It works, too! When I don't close in properly I can guarantee myself a stupid mistake and two to four weeks of physiotherapy, followed by six months of reconditioning. It doesn't take much. But for what karate has given me, it's worth it. I walk better, fall better, carry bags better, so much is better. The pain is not better. But I'm stronger and smarter about handling the pain, more aware, and more focused.
Advanced kata could involve fighting from a chair, using splints as weapons, and with other mobility aids. We'll see.