You can get Thai child NON-O 3 month visa if your kids mom will go to immigration with you to take pictures with the kid, and after can extend for one year. Must have money in your account for 60 days before applying.
With thai child follow non o visa, you can just make work permit with it. No need to change to business.
for me it’s a difficult question. I was born in Moscow, grew up Michigan, spent early adulthood in Stockholm and here almost 10 years. By birth I’m Russian but really not sure lol. World person.