Email your regional CASA safety advisor (see their website) for a usable answer - no point getting the info off a bulletin board, really. Since this Part 61 bizzo was implemented I've been sending off questions as they invited us to do at various seminars, and they've been getting back fairly promptly with useful answers. If they don't know they pass it on to someone who does (or is supposed to anyway).
That's not to say some of the answers haven't been a bit non-committal or ambiguous at times, but in the main have been very good.
On your question, I think the RPL without a nav endorsement is clearly meant to be like the old GFPT, ie fly in the local training area but don't go naving anywhere. If there are usable airfields in the local area, I don't see why you can't land at them if you've been in with an instructor, but I'm pretty sure you can't just hop in less than 25 mile legs and go around Australia.