it's going to be interesting to see what immigration does with these DTV visas once they start coming up for renewal. It may be the case that you have to visit a foreign embassy on every 180 day bounce.
Thai language schools and Muay Thai gyms that provide classes for people on education visas typically handle the paperwork for you. Find a school, ask them, and they will sort you out. Most can get you from a tourist visa to a non-o, no problem
1900 baht at any immigration office in Thailand... pretty cheap, but you have to do it yourself and have the correct documentation including the 800k THB in a bank account sourced from outside Thailand. Or you can pay an agent to handle that and everything else for you, but it's a lot less cheap.
then you may need a lawyer to fix it all up for you. Certainly possible, just how much hassle is unclear.
It sounds like yes very much you can do what you want, buy property in your child's name and live in thailand. You'll be doing yearly extensions to a visa and 90 day reports and all that, and you can't sell or mortgage the property... but you can do it I think
it kind of sounds like if the mother is there to give conscent you don't need a court even if the child is an infant... but then again, it's Thailand it's probably up to the particular office and officer you visit? Who knows... i'd ask a couple lawyers.
Yes i think you're right, and also it's possible that as long as the marriage was registered that might actually be enough... at least according to chatgpt. It gets stuff wrong a lot but it still knows more than me about this subject. Obviously you want legal council on this I would think... anyway
and again none of this matters until you are recognized legally as the child's father in Thailand.. and since you were not married at birth, you need a lawyer to fix that