Covid extension is still possible, just tick the box 'other' for the reasons, and I just noted: 'travelling' as the reason and it worked, this tip was given by a local employee here at the immigration
ah so 4 months in total a year, and with air unlimited, that's interesting, I wonder what the cheapest flights would be, could be just 50 dollars or so no?
So that would be 7-30 euro train, 50 euro flight, and then 1.9k baht to extend the other month, so 130 euro for every 2 months.