It is single entry for support of thai child not multi that the person on ASEAN forum got (Ron is relying a picture, its not him). It says single on the stamp. You are right about the rest. The person on ASEAN forum forget to specify what he was applying for.
You can do METV in Finland (Multi Entry Tourist Visa) which give you 6 months and if you active your last entry at 5 months 29 days, you basically get 9 months. Or you can do 90 days Single Entry Non-O in Finland and extend 60 days later which total 5 months. Or can you do the same Single Entry Non-O but pay an agent around 25k baht to get yearly extension without needing the 400k baht. An agent can provide that for you in Thailand. It's bribery but stamp will be legit. There always a way to stay long term if you want to. It depend how long of a trip you want. Years? 6 months?
You can only apply at immigration not online. It's the same as applying for 30 days visa exempt. I've done it twice this year. I've done 30-30-60 (30 days visa exempt extendable for 30 days followed by 60). The reason for the extension switch from visa exempt to marriage so you can do both if married. Since the Non-O is based on marriage you can only do 60 days not 30-60. You need your wife blue book, id card and marriage certificate, and the rest is the same as visa exempt or tourist visa extension.
Can I see your stamp? The other one posted here from ASEAN was debunk by my wife for being based on "having a child", not for "marriage". Above the "USED" stamp there is a Thai sentence. Multi Entry for having a child was never possible in Savannakhet, only for marriage.
Fyi, my wife debunked this picture to me. On the top left (above the "used") stamp, it read: อุปการะบุตรไทย (in very old style). This refer to Non-O Single Entry based on having a child, not marriage.
We will know for sure in the next 3 days. I only saw 2 report of denied today which is not a lot. If next 3 days people keep getting denied then yes it's fucked.
I got told that there was 250 people in Savannakhet today. It was jam pack because it was holiday monday. So it could have been just a very bad day for them and they didn't want to deal with Multi.