, there should be one of the more than 70 Immigration offices š in the neighbourhood (Google maps). And indeed, when you aleady have a TM30, it's a bit more safe to ask for the extension. You can do it right away over there because the 30 days will be added to your current days.
I don't know for each country, but I remember told by A lawyer from Isaan Lawyers, that now it's possible to make a cross reference to a will from your home country and a Thai one. Again, you have to ask.
, been bit busy with birthday wife. Umm, it's a Dutch/Thai tax treaty. Old treaty from 1975 to prevent double tax payment. Most people could choose where they wanted to pay tax when 'uitgeschreven' out of the Netherlands. So you could get tax exempt from Netherlands and many times pay less tax in Thailand. Now the treaty will change in that it's mandatory to pay tax in the Netherlands. For many Dutch expats/retirees this costs quite some money.
Then better via the Dutch Embassy. But probably almost of no use to be "uitgeschreven' (Except legaly mandatory after 8 months living here), anymore should the new treaty between Netherlands and Thailand be implemented 1-1-2023 š