@John *********
when applying for the 90-days Non-O visa, the 800,000.- THB or equivalent in another currency (!!) can be on a bank account in your name in Australia or ANY other country!
Only when applying for the "1-year extension of stay" out of the visa, the money needs to be in your Thai bank account.
And the same applies if you do the financial proof with your income: for the visa application, original income documents are accepted by the Thai embassy or consulate in Australia.
However when you apply for the EOS in Thailand, Immigration will only accept "legalized by your embassy affidavits of income".
Which I guess your embassy in Bangkok doesn't issue any more
And you are correct: when applying for the 1-year Extension of Stay Permit, the 800,000.- THB deposit on the day of application, has to be seasoned in your Thai bank account for two months.
After being issued the EOS, a minimum of 800K need to stay in your account for three more months. During the rest of the year, the deposit cannot go under 400,000.- THB. And two months before you apply for the next 1-year EOS, the 800K need to be back in your account