Australia is a VERY popular country relative to its size. Australia is more popular than every European country except Germany, UK, and France. Australia has more soft power than you think. Everyone knows the sterotyipical Australian. The sterotypical Australian is very popular worldwide and has a good repuation. Being Australia is considered sexually attractive for some reason. We got lots of soft power. We got more soft power among the Asian countries whom consider us prime countries to move into, because of less violence and close proximity.
I read somewhere that Sydney's brand value was 5th in the world. List goes London, NYC, Paris, LA, Sydney, Singapore, Tokyo. Sydney has a higher brand value than Tokyo. People would rather go to Sydney than Tokyo. Personally i don't know why. Sydney is the most boring city in the world, Singapore is better in almost every way, but people love Sydney for some reason.
Also you gotta think about this from a Japanese perspective. Anime are made for Japanese people first, weebs second. Korea is not very popular in Japan. It will probably be when the boomers die, but it isn't now. Seoul didn't even get a mario kart 8 deluxe track and fucking bangkok and mandrid did for some reason. Korea never got a pokemon region. Japan wouldn't want to promote Chinese culture because of geopolitical conflicts and WW2. India isn't disliked by the Japanese, but it certainly isn't liked either. India no longer is considered spiritual. That went with the British lmao. USA already has tons of influence in anime. Many animes have american charecters and a few are set in american cities.
However Australia has a lot of untapped potential honestly. Australian culture and identity would be a very interesting theme to explore. There are many Asians in Australia. The Japanese are more interested in Australia than most places. Having an anime with Indian, Chinese, White, Black, Muslim charecters would be very interesting and it would only be possible in Australia.