It’s done in a different province to the one in which you live, many Phuket residents who use an agent get their visas issued in Pattaya - so they have to hand their passport over to a third party for their 90 day - if you try to renew anywhere else other than Pattaya (or wherever agent obtains the visa) you will be denied - and sent to that province - stuck in a hamster wheel effectively but everyone to their own.I know many folks who take this route fine until something goes wrong as it occasionally does.
After first year of maintaining 800k , and leaving it for 3 months in second year you can switch to the 65k a month for the second year - once you go with an agent very difficult to extricate yourself in future years , especially if they put up the money not to mention the risk as it’s not legal.
Annual event these announcements - same same but different nothing will change, a few more dumb tourists will get milked residents should be smart enough to stay out of the brown stuff.
You will be breaking the law, and regardless of Will relatives can access the account allbeit through a local lawyer - I speak from experience - a Will is best way to go however takes care of all potential issues for those you leave behind.
Many folks from Phuket have been going to Phang Nga to get renewals done, due to 3 month appointment scam here to try and force people to use agents, so not sure about the same province story.