Have you ever considered bowls?
Shocking as it may be to some - bowls is both a sport for the incapable (aged, ailment, uncoordinated) and the laxidasical.
It may help with your rehabilitation as well as helping with your desire to excel in a sporting nature. Alternatively it may well offer nothing more than another topic for programming.
If the desire takes hold, and you wish for further details.... please do get in touch.