My feedback :
I entered on visa exemption this week and went to Chaengwattana today (appointment on line).
I will get my visa stamped on my passport on november 28th (it takes 18 days fro me) :
I gave them all what they required, among :
* a revenue statement from my embassy.
* copy of TM30
* copy of AirBnb receipt for the next 30 days
* copy of the main page of my passport along wih copy of my entry stamp.
They mae a copy for me of revenue statement, stamped it and said I could use it again when I will ask later for an annual extension.
I think I forget nothing.
I came with my previous passport and therefore they asked for a copy of pages since 2019 when I had my first Non-O visa. Happily I had made these copies just in case. If I had not shownn that old passport, probably they wouldn't have asked for it. Normally french authorities now keep old passport, unless you still have a valid visa on it.
With an appointment everything was done within 30 minutes.
The BTS now goes almost to Chaengwattana, which is very convenient.
In 2020 BTS line stopped at Kasetsart N13, now I can get off at Wat Phra Sri Mahathat N17, which is much closer to Chaengwattana, and even goes farther.
Thanks to all for information and advices provided, Ubon Joe and Dr Jack54 among them.