LPM would be stretched for space to install BuzzSaw, especially since it's a park model. Don't be fooled by its compact nature as a coaster, it does take up a decent footprint by LPM's standards, and a lot of their rides are transportable models so that they can reshuffle around the park when something new is installed and needs space. This would be a huge investment in terms of space and logistics, they'd probably have to axe a few attractions to fit it, and BuzzSaw isn't worth that.
Aussie World, mayyyyybe, but their current new investments are still ongoing (somehow...) and it might be a bit out of the blue. I don't know if the hassle of reshuffling their new attraction plans would be worth the finished product.
Adventure Park has nothing of this scale whatsoever. That's not to suggest they can't afford or don't want it, but it would be a surprise to see them take it, and it would be very out of place at the park. That said, expansion into the thrill ride market is something I'd love to see for APG, so I'd be happy to be wrong.
Never been to any of the others, so no comment, but Adventure World seems most likely of the rest, and I still don't think it's probable. It doesn't seem worth the cost of international shipping to Rainbow's End, and the other two are also not quite at that scale in the thrill ride market yet. For parks investing in their first "big scary ride", I'd prefer to see them invest in a new ride that would not only be something new for the Australian market, but would be supported by the manufacturer and hopefully a much more sensible long-term investment.
My bet is BuzzSaw is headed somewhere in Asia. A lot of Chinese parks out there expanding very rapidly, and South-East Asia seems to be a good market for it as well.