Good call Jay (aka Sharkbiscuit) - you can be the Official Windsurfing SA Northern Beaches Forecaster :-)
It's easy to get mesmerised by those red arrows, but the seabreeze site doesn't actually forecast seabreezes - should go back to the old method of sticking the head out the window.
I was on secondment for a special project on the request of the Windsurfing SA committee. I did a run from Moana to Southport and back. Wind was 10 knots SW, board was an Exocet Kona, sail was a 5.8 wavesail. Tide was coming in from a 0.7 m low and maybe a 1ft wave, perhaps a bit bigger on the odd set.
Got a stack of front-side rides up around U-turns, and had most of the coast to myself. I reckon this is a good option for these conditions - just need a SUP style board and a smaller sail, and at least 10 knots to give you enough mobility in the onshore conditions. It was too windy for paddling a SUP by the way. Max speed was 13.7 knots, which was recorded on a wave. Otherwise I was plodding around, poking my head into various channels etc. Managed to avoid washing up on the rocks but skimmed over a few sections that were a bit too shallow for comfort

Whether I can convince anyone else that this trip is a good idea is another question :-) I should check it out in a light SE too, but I except there would be more surfers