What are the requirements and timeline for extending my Non-Imm O-A Visa given my financial situation and health insurance options in Thailand?

Hi, I’ve just joined the group and have read many of the posts and there is a wealth of information, so I know I’m in the right group.

I have a Non-Imm type O-A and the VISA expiry date for a ‘border run renewal’ expires on 3 September, but entry stamp permits me to stay until 15 October. As it appeared the borders were not going to open, I visited the Yasothon Immigration Office last week, to determine my options, and the lady there was extremely nice and very helpful, although I think she could have given me more advise as to time lines. She advised that if the borders were to open before 3 September, I could get renewed but I would need to get the health insurance which came into affect after my first entry.

With the borders unlikely to open, she advised that my only other option was to apply for retirement visa, and I would need the 800K in a bank and health insurance, and I could apply prior to 15 October. As such, she provided me with some documents on the insurance.

Now my questions are two fold, firstly the 800K which won’t be a problem once I open an account hopefully in the next couple days, but even if I can open an account on Monday 17th, the 800K won’t get there from Australia until perhaps the 20th August! Do you think this will be a problem?

Secondly, the list of insurance companies on the document provided to me by Immigration are ‘participating companies’ and I’m being told that these companies are not the only ‘approved companies’ and that I can use any of the 168 Insurance companies that provide service in Thailand as long as I get the 400K/40K Cover. Is this correct?

Thanks in anticipation of good advice.