No expert at Kings at Port Augusta but the gear you state is good, Kayak would be interesting and it has been done by others with good results as 2 years ago a young lad was in the sunday mail with a nice king from a kayak, another guy 2 years ago for memory caught a nice king also from what looked like a bath tub and yesterday when I went up for a try a very small polycraft boat turned up.August would be a good time to be heading up.You are reasonably protected up there but can get a bit lumpy on any given day.Good luck with your venture and I might bump into you as I plan on giving it a few