What are the requirements and rules for the Thai retirement visa and the 800k THB deposit?

Hi! A couple questions about obtaining a retirement visa:

I currently have a 1 year Non-O extension based on marriage that expires in March 2026. I’m considering transitioning to a retirement visa sometime between now and then.

My first question is re the 800k THB in-bank. I understand it needs to be seasoned in a Thai bank account for 2 months before application. I’ve read conflicting descriptions of what can be done with the 800k once the retirement visa has been approved/ stamp placed in passport though.

Some have said that the 800k needs to be kept in the account as is throughout the year (even after the application process has been completed). Is that correct? This makes no sense to me. Rather, I believe once you have received the retirement stamp, you can start withdrawing funds from said account.

When, can one begin to withdraw from their 800k deposit retirement requirement after the retirement visa has been received?

Also, I already have about 200k in my Thai account. Can I just Xfer an additional 600k from my foreign account to meet the requirement, or do I have to make a single 800k transfer from a foreign account. (I know this is immigration office specific. I would be applying at the Chiang Mai office.)