UPDATE
I've done my visa change from exempt entry to NON O retirement (it's actually a visa application, model TM87) with money in the bank option, in Chiang Mai.
The experience was quite smooth, no crazy long wait or requests.
There is a new model to fill in for "fact checking information" STM 11. Easy one.
Because of all the Immigration holidays in April I happened not to have enough days left for my application (even though I applied almost one month in advance), so I had to pay 1900 baht for a visa exempt 30 day exstension I could have avoided if going there 2 days earlier. So mind on that!
I paid the 2000 baht fee for the visa application and I was given a receipt saying that application is under consideration, and I have to come back on 24-4-25 to get the 90 day stamp.
I applied on 28-3-25.
My actual permission to stay expires on 22-5-25.
Question: do you maybe know what date my 90 day stamp will start from?
Cheers