The info I found is a little confusing.
Sailboards or kiteboards
SEMI-PROTECTED WATERS when less than 400 metres from shore must wear Level 50, Level 50S or Level 100 or above
SEMI-PROTECTED WATERS is classified as waters inshore of a line 2 nautical miles seaward of the low water mark of a coast or the banks of Lake Alexandrina and Albert.
Why stipulate 2 Nautical miles but then put a 400 metre restriction in there?
How far out would we be sailing?
400 metres from the lowest water mark on a 0.1 metre low tide at Seacliff for instance would be considerably further than a 2.1 metre high tide.
Neil Pryde make a High Hook vest. I have one but would hate to wave sail in it.
Forward WIP appear to make the most suitable PFD but even this looks a bit too cumbersome.
images.app.goo.gl/mFiBLRpPbeTEAssS9