When applying for a Non-O in Thailand, as far as I know, you have to prove the funds in the Thai bank account being from overseas. This requirements is not relevant for Vientiane (at least there is nothing accordingly on their website).
On their website the Royal Thai Consulate Savannakhet writes, that a pension letter or a prove of retirement issued by the applicant's Embassy/Consulate has to be provided with the application. As I am not officially retired yet, I will not be able to bring such a prove. So your option unfortunately does not seem to be suitable for me.
I do have that letter signed by my insurance. But Mukdahan Immigration insists on paragraph 5.2 of the TIB order
********
, which states that such a letter in addition has to be certified by either the German embassy in Bangkok or the Foreign Ministry in Berlin. And as said, the German embassy says they cannot certify an insurance.
No. They told me, they cannot verify the letter, as they cannot prove whether the coverage really exists. They further said, that checking and approving of health insurances solely is the Thai authorities duty.
Thank you so much for your detailed answer. So I understand entering on visa exempt is possible. I was scared a bit, as I read that visa exempt is for tourismn purposes only. And when immigration sees that I loved in Thailand for the past 2.5 years and just was out of country 10 days to Vietnam, that they will not approve visa exempt to me.
With regards to all the other questions, I anyway will have to see Mukdahan Immigration in March for my next 90-day-reporting and will ask them in person then. Just wanted to be prepared best possibly.
I am in Mukdahan. And the forms they gave me for e.g. acknowledgement of overstay just have been one-sided. But no problem to bring both options to be prepared. 😉