at least it sounds like you got it right 😂 You just mixed the retirement/marriage thing in your original post, that's why.
Just remember that for retirement visa it's irrelevant whether you are married or not, and for the marriage visa it's irrelevant whether you are old enough for a retirement visa or not. They each have their own requirements and they dont mix.
yes, if you get a non o based on marriage from london, and want to make a yearly extension in Thailand you need to show the marriage certificate (kor ror 3, the rose border one) and an updated marriage document from ampur (kor ror 2). That's if married inside Thailand. If you got married outside Thailand, it would be a kor ror 22.
the Vancouver embassy is only able to give out the initial non o. And yes for that, you can use money in your home country. Once in Thailand that will become useless. They cannot issue a yearly extension of stay. Only immigration inside Thailand can do that. And for that you require either the bulk amount in a Thai bank account, or have an embassy willing/able to issue a verified income affidavit. Using monthly transfers in any case is only possible from the second yearly extension. For the first one it's either bulk seasoned amount or embassy verified income. *Edit* ( Your countries embassy in Thailand, not the other way around)
So unless you travel in and out, not needing a yearly extension, and only buy single non o from the Thai embassy each time, then what you are suggesting is useless.
if you are from the US or UK or any of the other countries who's embassies no longer provides income affidavits, then you cannot use the 65K for neither the initial visa or the first yearly extension. That could be an option from the second yearly extension onwards, by consistently transferring in, as a foreign transfer, 65K each and every month to your Thai bank account, for at least 12 months before applying for the yearly extension, while also maintaining the 800K for the existing extension.
You seem to have some wires crossed. You talk about visa based on marriage but then also about the "retirement visa" (based on being over 50 years old).
Beware that you cannot mix and match.
Make sure the non o you get is based on marriage if that is your intended route.
For this you need 400K in a Thai bank for your yearly extension. (Plus other various paperwork of course)
If you go the retirement route, you will need 800K for your yearly extension.
If you get the initial non o based on retirement, you cannot get the first extension based on marriage, and vice versa.
it won't be easy finding a job though, being 60 or more. 60 is the forced retirement age for Thai teachers. That rule doesn't apply to foreign teachers, but, they are rarely interested in hiring someone over 60, unless you already have history with them, or offer to work for free or something.