What are my options for extending my Non-Imm O Visa in Thailand after 90 days?

I know I’ve asked many questions already but everyone been so helpful...

I am on a METV from UK runs out mid May.

I am returning to UK early May, hopefully wife my Thai wife (I am presently applying for a Travel Visa for her and also we are getting officially married next week in Bangkok).

I am only in UK for about 3 weeks in May and will be living 5 mins from Hull Thai Consulate (visiting a family wedding).

I will apply for a single entry Non-Imm O Visa based on being married to a Thai National at Hull Consulate (they send it to London and return to me at Hull Consulate within about 7 days) this will give me 90 days in Thailand on my return.

Question: what are my options for extension before the 90 days are up, I am more than happy to travel to anywhere like Savanaket to change or get extension of stay on visa if you can do.

Thank you🙏