skatewash

Yes, that's true, Non-OA visa and extension holders specified in the quoted text above have been grandfathered in according to the old rules that were in effect at the time and are not subject to the new rules. At least that is true in Phuket.

Assuming you are in Thailand on a marriage extension of stay obtained from Phuket immigration based on your non-O visa for purpose of marriage... You will first off need a re-entry permit from Phuket immigration (1,000 baht for a single entry, 3,800 baht for multiple entry) that will allow you to keep your current permission to stay when you re-enter Thailand. Under the current rules for Phuket Sandbox (which may or may not be in effect in November) you would need to be fully vaccinated. You would need medical insurance for covid with a minimum coverage of $100,000 USD for the period of time to completely cover your current permission to stay. Note that the insurance is normally sold in standard durations (1 month, 2 months, 3 months, 6 months, etc.) so you will need to purchase one that covers the entire period of your current permission to stay. Because you are on an extension of stay due to marriage you do not need the general medical insurance that is mandatory for Non-OA visa holders.

I would go there with your documents in case you can be fit in that day. If not, you will get an appointment. I'm not sure the online queue is working for any foreigner. It didn't for me.

Yes, do the online viewing. Office is open again. Likely the first time you go you will be given appointment to return.

I am under the impression that DHL only allows domestic shipping in Thailand for relatively high-volume businesses not individuals. Do you know differently? For example, clicking on "Get a Quote" on the site you reference leads to this: https://www.dhl.com/th-en/home/our-divisions/ecommerce/customer-service/contact-ecommerce-business-get-a-quote.html

Go to immigration on Monday. The worst you should face is a 500 baht fine for being on overstay for one day, which they may waive. You should be able to apply for your extension after you settle the fine, if any.

Australians get 30 days extension of a visa-exempt entry and have for a long time. He could come to Thailand on either a visa-exempt entry (30 days plus 30 day extension = 60) or a Tourist Visa (60 days plus 30 day extension = 90). Either will allow him to apply for a Non-O visa at the immigration office in Thailand. Which is best depends on convenience and length of permission to stay. Visa-exempt is easier but gives you only 60 days to open a bank account and apply for a Non-O visa. Tourist Visa requires purchase from Thai embassy/consulate but gives you 90 days (with extension) to accomplish opening bank account and applying for the Non-O visa.

Thailand Plus is not required to enter Thailand, though there is a lot of erroneous information to that effect around. The Mor Chana app is the one that is required. As a bonus Thailand Plus doesn't actually work at the moment.

Yes, Phuket Town is the closest to normal of any place in Phuket. Also, 2021 Phuket Vegetarian Festival will begin on Wednesday, October 6 and ends on Thursday, October 14. It is an amazing festival and is centered on Phuket Town. https://www.jamiesphuketblog.com/2016/04/phuket-vegetarian-festival-schedule.html?m=0

Apologies to the OP, I was unaware of this new requirement which takes effect Oct. 1.

Krungsri Bank ATMs allow only up to 30,000 baht (the most of any Thai ATM) per withdrawal and charges 200 baht if you are using a foreign ATM card.

The US has never had any covid vaccination requirements for visitors to the US, so I'm not sure what news you are talking about. Possibly you are talking about UK requirements for vaccination of visitors and returnees? -- https://wwwnc.cdc.gov/travel/destinations/traveler/none/united-states

A very simple restriction that unfortunately is often very badly expressed: if you participate in the Phuket Sandbox you cannot visit Bangkok prior to landing in Phuket. That is, no transiting in Bangkok.

While you can apply for your extension of stay up till the date the current one expires it's not recommended. You can apply 45 days before your extension of stay expires in Phuket. Doing it early gives you a great deal of time to rectify unforeseen problems. My understanding is that Phuket Immigration has required for some time now a yearly summary of transfers for those using the monthly deposit method. It's also my understanding that Bangkok bank takes up to a week to produce such a summary because no more than 6 months of customer data is retained at a Bangkok Bank branch (the request has to be serviced by the main Bangkok Bank office in Bangkok). It's an unfortunate situation. Clearly you have complied with the functional requirement of transferring the required amount on a monthly basis, but without the evidence required by Phuket Immigration to demonstrate this to their satisfaction. What did Phuket Immigration suggest you do?

When flying to the Phuket Sandbox your plane cannot land in Bangkok.

Up to this point I believe all the Pfizer vaccine being administered in Thailand has come from a US donation. All the vaccination programs I have heard about in Thailand involving Pfizer have been for those who had not previously received any covid vaccinations (an exception was made for a third Pfizer booster shot for those frontline medical staff that have been vaccinated with Sinovac). So, I would say no, not to my knowledge. That may change as more people become vaccinated, but I believe that's the state of situation at the present time.

True, but you can enter Phuket internationally via Phuket ALQ which is the only way an unvaccinated person can enter Phuket.