Hello Blue Chairs,
From memory I don't think Mr. Blue Chairs will have any problems with a good onshore breeze at the Southern end of Issos Beach where the road from Linia comes out on to the beach. I seem to remember windsurfers going along at what seemed like breakneck speeds about a quarter of a mile out on most days.
I also seem to remember that the windsurfing school at Issos was always busy and would be surprised if it did not start up again next year.
An afterthought, is it not possible for Mr. B C to take his own board ? It may be worth asking the company you book the flight with ?