I have seen a few out on ocean beach over the years while I've been down there.
Middleton Beach would be good with a SW, or anywhere in the habour - the jetty as you drive in from denamrk seems to attract a few kite surfers.
Otherewise a good launch spot if you're keen to sail on the denmark inlet is crusoe beach.
But tbh... I brought my gear down one christmas and it was just too cold. I can't imagine windsurfing in a wetty.
Have fun if you do