Just my opinion....you could consider return flight to Udon Thani and short minivan to friendship bridge ,(Nong Khai)
You don't need an agent.
Both Vientiane and Savannakhet require an appointment.
@Tod Daniels may have advice..
You state that you WILL turn 50 in January. You cannot obtain a non O prior to turning 50.
At most immigration offices you could obtain a certificate of residence however at Bangkok you cannot unless you have a 90 day report..
OP, your post makes zero sense.
Certificate of residence is irrelevant.
Which immigration office?
When 50 you can enter Thailand visa exempt or tourist visa and apply for non O retirement OR obtain non O in own country.
You need a Thai bank account in your name only
Seems various immigration offices have moved towards requiring bank statements.
This happened to me last extension at CW.
I had couple of months with zero activity. They wanted me to provide 12 month bank statement.
Fortunately Kasikorn could that on the spot. BBL cannot.
Dial me up an agent!
This question has come up previously.
Not quite the same but not long ago a chap applied for SETV eVisa in UK.
Approved on day he was leaving UK.
Wanted to know if he could enter visa exempt and "save the eVisa" for a border bounce later.
Using funds in bank method you would require 400k in bank seasoned for 2 months prior to application and maintain that for the under consideration period.
After that the funds can be used.
Regards the "bank certificate" that is simply a statement from bank that you are the owner of the account.
Best to obtain that on day of application (if possible) also make small transaction to show activity.
Your bank book should be sufficient to show the seasoning of the funds.
Not a case of someone got lucky.
You would be doing the wrong thing.
There are nearby consulates to obtain various visas for Thailand eg Savannakhet, Vientiane etc.
In addition some visas can only be obtained in own country or where you have permanent residence status
Forget non O-X (5+5yr)
Attached thread below.
Best advised to obtain a non O based on retirement and do annual extensions.
You can obtain a non O in Thailand from a visa exempt or tourist visa entry OR from nearby consulates or in your own country. Some provide eVisa..
https://aseannow.com/topic/1320280-non-immigrant-visa-type-o-x/