Brilliant to see Paul get back to what he loves.
It may be that there are ways to make windsurfing more suitable, but I think it is going to be difficult to adapt the equipment and get a great result. I love windsurfing as much as anyone, and if windsurfing is what he craves then I'm sure some adaptations are possible.
He could still get out on the water with his mates with a kite and board and it does seem that that could put him more on a par with others on the water. Just giving my opinion as a windsurfer that the equipment might offer more potential.
www.sitkite.com/nieuws/when-sitkite-meets-f-one