The best replacement for australian is british accent.

The best alternatives to australian are rated as following:
★★★★★  british accent
★★★★  new zealand accent
★★★★  american english
★★★  american accent
★★★  american words
★★  us sizes
★★  american culture
★★  western saddle
★★  american dollar
★★  british
★★  us currency
★  american lamb
★  new zealand flag
★  australian
★  american wilfred
★  us dollar exchange rate
★  canadian immigration
★  english accent
★  new zealand dollar
  us shoe sizes
  american labradoodle
  us dollars
  american slang
  western saddles
  aussie
  american shoe size
  american currency
  us dollar exchange rates
  canadian dollar
  american spelling
  english words
  maine lobster

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Speaking about australian, one probably shouldn't forget about no arms and legs.

Other search terms related to australian and their ratings are:
★★★★★ no arms and legs
limbs
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australian
british accent
new zealand accent