E-bike rules in Australia will soon change with possible ban on sale of bikes faster than 25km/h
(www.brisbanetimes.com.au)
The 500w have only been legal briefly due to a loophole. They were never meant to be so
Got a source on that? All NSW's pages describing the law, which presumably had to be specifically written describing the intent of the law, said 500 W.
a 500w bike won’t do what I need
What is it that you need? If you can make a good case I might be convinced. So far, nothing I've thought of fits the bill, since 500 W + a bit of leg power is enough to be able to get up hills while carrying heavy loads, as far as I can tell.