I was over there recently but didn't have much luck with wind, when its on though there there is usually a few crew (including Bretto) at 4 mile, so I'd imagine borrowing a pump shouldn't be a problem.
There is no accurate graph for Pt Douglas but the locals seemed to use a combination of Cairns and Low Isles graphs to determine it because it is usually somewhere in between the two.
As KH said Brett can organise charters etc, we went on one to try and get some wind as we were getting none in PD, but even on the reef we did more snorkelling than kiting.