What are my options for changing my visa from Non-O to Non-B while facing immigration challenges in Thailand?

Question, for many years i been on the non B then covid close the business and changed to non O based on my kid.

However now i am trying to obtaint he non b again. located on Koh samui. they dont let me change from non o kid based to non b. so made me fly out and back in (singapore) to enter on a tourist to be able to apply for non b withouth leaving. however on the day of signature they found a overstay of a signle day. and didnt want to sign. pushing me to go on visa run again to get a new tourist on a blanco page in my passport but i refused to participate in another formula 1 mini van to malay.

im looking to fly out to vientiane, but unfortunatly they booked up with apointments till july. Is there any other embassy's you recommened if you got all your papers in order. ( the company inviation, the education certficate the w32 etc etc)

ah and the internet says that you could walk into a imigration changing to non b but ofcourse in reality it not work or are there any places in bangkok that could do this ?

Look forward to your replies