As previously stated. I have not read a report of not being able to obtain a non O from visa exempt entry (land or air entry)
So believe it when first hand report.
Can imagine Immigration can give you a hard time, esp for based on marriage.
There is very little apart for funds in bank requirement for non O retirement.
Jomitien played a strange one (don't know if still current) requiring the funds in bank 2 month seasoning for the non O.
That is rogue