: Thank you so much for confirming. I'll set a calendar reminder to make sure I don't lose track of the date. I'll play it safe and will do it 14 days ahead (via the online site).
: When I will be stamped back into Thailand, I know that the entry date is written. Is there any mention of the next reporting date, or do I understand correctly that it will be up to me to track this? I ask this, because when I did my last reporting they gave new a paper which mentioned the next renewal date (and stapled it into my passport).
: Thank you for clarifying this for me. I was not aware that the 90 day reporting was only for consecutive days spent in Thailand. I was aware about the re-entry permit requirement, and I already have a multiple-entry permit.
: The only alternative to the above procedure is waiting for the expiry of the current Visa and changing the criteria to "Thai wife" on the next extension application (and of course providing all the other necessary documentation).
: I went back to the immigration office at Chaeng Wattana today and, after some lengthy explanations, was given a procedure that I can follow in order to change the type of Visa (without having to wait for the expiry of the existing Visa). I am sharing the information in case it might be useful to someone else on this forum.
This does require travelling out of Thailand and then coming back into Thailand. Here is the procedure:
1. On the day that I plan to travel out of Thailand, go to the immigration office and request that the current Visa be cancelled. They will then cancel the current Visa. As I understand it, it will be cancelled on the passport itself.
2. On re-entry to Thailand, get stamped-in on a 30 day visa exemption.
3. ASAP after re-entry, apply for the non-O 90 day visa based on marriage criteria.
4. After that, proceed as usual in order to get the one year extension to the new 90 day visa.
The important thing in this procedure is that you have to synchronize the cancellation of the existing Visa to be right before you plan to travel out of Thailand. After the Visa is cancelled, you are required to leave Thailand as soon as possible.
: I've decided to apply for my retirement Visa from within Thailand. It makes things simpler and avoids having to buy insurance which covers OPD which I would not want to buy.