If you can show the paper trail, amount leaving your AUS bank on X date, same amount being deposited into your Kbank account on Y date, any reasonable IO will accept the documents.
exactly what visa are you looking at? The only 5 year visas are the Elite visa, the DTV, and maybe the LTR (10 year I believe). Each has advantages and drawbacks. Which exact visa type are you thinking about?
It's been a frantic overhyped doom and gloom media push. It all hinges on KYC, know your client, due diligence. 99% of people have zero to worry about.