How can I open a Bangkok Bank account quickly as a traveler to Thailand without a letter from my home bank?

Good morning everyone.This is a follow up question to some of my previous correspondence.

I am travelling to Thailand at the end of April on a 60 day e-visa which I plan to extend by 30 days. In the mean time I will apply for a Non O visa based on marriage.

I understand that I will need to open a Thai Bank account in my name only and deposit 400,000 Thai Baht.

I've been reading advice on how to go about opening a new bank account in Thailand.

I note that it is suggested that I provide a letter from my bank in my home country requesting that the Bangkok Bank open a bank account for me.

However when I contacted my bank and requested that they provide me with a letter of request they informed me that they do not provide this service.

My question is such is :

In order to open a new bank account with the Bangkok Bank quickly and easily what should I do?

Thanks in advance.🙏