I'm Australian born and bred, lived here my entire life, and I say 'tomahto' and 'eye-ther'. I'm also firmly on the right-hand-side of the trap/bath split.
It's a mistake to think that there is a single Australian accent.
There's definitely a few different Aussie accents.
I live in central Melbourne, and most people I meet have an accent very similar to a Kiwi accent, close enough that after only a year since I came from NZ, most people think I'm an Aussie. The accent has been easy to pick up, just say 'feesh and cheeps' and use a high rising terminal (like you're asking a question), and you're good to go.
However, go to the outer suburbs, or rural Australia, or up the coast to NSW or QLD, and you get a whole array of different accents. You've got the ocker accents, the wog accent, the aboriginals have their own accent.
I live in central Melbourne, and most people I meet have an accent very similar to a Kiwi accent, close enough that after only a year since I came from NZ, most people think I'm an Aussie. The accent has been easy to pick up, just say 'feesh and cheeps' and use a high rising terminal (like you're asking a question), and you're good to go.
However, go to the outer suburbs, or rural Australia, or up the coast to NSW or QLD, and you get a whole array of different accents. You've got the ocker accents, the wog accent, the aboriginals have their own accent.