Start off with OA visa, which will do you for two years without having to transfer 800k into Thai bank account. During the two years start transferring 65k into Thai bank account every month (you can access and spend this immediately it registers in your account). By the time the two years is up, you will have sufficient monthly transfers to qualify for the O retirement visa. You will need to exit the country, come back in on visa exempt, and apply for the 90-day O visa. With thirty days remaining on this visa apply for the 12-month extension. Whatever you do, do NOT miss even one monthly transfer from overseas. Keep this regime going indefinitely, and extended every year
The only thing which might change is this soft power option. I can't see how a three week cooking course gets a five year visa, but maybe the government is hoping this will entice people to come back frequently for long stays. If they're in the country spending money, I guess the aim has been achieved
I only maintain ties with Australia because it suits me financially. I don't give a stuff about governments or politics. I'm retired and when I retired I decided my life is now all about ME. Australia offers terrific concessions to Aussie Tax Residents and because of that I will never cut my ties, to do so could potentially cost me hundreds of thousands of dollars