Yes, applying for your Non-O in Australia, you can use the 65k income method using your home bank account but your first 1 year extension will require 800k seasoned in a Thai bank account
A small sum will not meet the 800k/400k requirements of your current extension so your next extension will likely be denied (both 800k and 65k methods).
That's not what was said. The "800k method" is 800k for the first 3 months of the extension then never below 400k for the rest of the year. You need to be doing the 65k transfers in parallel to this to have 12 monthly international transfers for the next extension.