No-one else complies with ICAO why should Australia...every country has its differences from ICAO including UK, US...China and Russia are metric..that ICAO?
In Australia read the AIP and comply with that...not hard really. If you fly long haul you soon pick up the little local differences around the world and modify your calls as necesary.
If more people read the AIP radio phraseology section there would be about a 30% reduction in words used in general...particularly on read backs...you don't need to read back EVERYTHING the ATCO says to you!!!