I actually don't know where, but there are some really good spots down there. Looking at the coast between Denmark and Walpole, the SE seabreeze is cross shore. When I was in Esperance and I looked at the south coast forecasts they seemed to get plenty of strong seabreezes along that stretch - more than we did in Esp.
There will be swell.... should be awesome DTL spots somewhere. There is footage of some spot down there on Scotty McKercher's videos
I reckon for B&J you'll be right around Denmark itself?
Have seen one ws and another time one kiter at ocean beach. Also seen windsurfing on the inlet in albany.
I recon you'd be crazy though, the waves will smash you in half, the water is freezing and you'd be all by yourself. (not including the sharks - plenty of them down there)