How can I obtain or extend my O visa as a UK passport holder with a Thai child?

@Alan ********

who told you that you can't apply using the eVisa system for a 90 day Non-O visa being a brit whose in germany?

The system will allow it and I think as long as you show an address of where you're staying there and meet the requirements you should be able to get the visa issued there

The in-country visa is 2 big steps process. You cannot apply for Non-O 'extension' directly on your entry stamp of tourism status (visa-exempt or Tourist visa)

1. Apply for an in-country Non-O visa based on raising a half-Thai child

You can apply for an in-county Non-O visa for 90 days stamp on your visa-exempt entry when you meet the requirements. You need funds seasoned, and 15 days or more remaining with your stamp as of the application date

2. Apply for a 1-year extension based on raising a half-Thai child

You can apply for a 1-year extension when your 90 days stamp remains 30 days or less

Go to the local immigration office immediately after entering Thailand to get their latest handout for in-country visa application and the following 1-year extension.

OR, you may go to Laos or Penang to get the initial Non-O visa based on raising a half-Thai child from the consulate there.

Honestly, I don't see the point of you getting a tourist visa if you go to the consulate for a visa application.