I called Bunnings and they don't hire them.
Looking at gumtree ads for tradies, people are asking $75 per hour on top of equipment hire and again the issue of being so far out just adds cost. I'd be paying someone $100 just to turn up before they did any work.
Fark it, I'll get the petrol one cos the cost isn't excessive (though more than I'd like) and it will be handy when I have to dig a lot more holes later. I've got 8 metres of fence to put up today and 34 metres down the track.