Hi Tony, I extended my visa recently (admittedly in Hua Hin) and was worried about the flight dates, but they did not even ask about the return flight, they just asked when I plan to leave. I explained I am planning to stay and apply for a retirement visa. It was really easy and the immigration staff were very friendly and helpful.
thanks for your replies, really comprehensive. I think I will do option 3 use the the tourist visa for 2 months and then apply for the o visa instead of extending the tourist visa for 30 days. Much appreciated advice 😊