Friends of mine who camped in that area used Jennylynd Creek.... Sorry if the spellings is incorrect.
Jennylynd is just on the southern side of Bustard Head, there maybe fresh water available in there.
My friends would camp in there for about two weeks at a time, they would take everything in there by boat from 1770, I have no idea regarding vehicle access & I havn't heard of any, however there is vehicle access to Bustard. Maybe if you contacted Parks & Wildlife, a lot of that area is part of the Eurimbula National Park.
Back to the JennyLynd thingo, if you ever contemplate the idea, do check the tides as Jenny is hard to access on anything but a making tide. No boat ramps that I know of.
Another option is Pancake Creek.. on the northern side of Bustard magic spot. I think you can access by 4WD, boat is ok on any tide. No camping facilities.
Hope that give you a starting point.
r.