American citizen, looking for some help with DTV application under soft powers medical treatment. Any advice would be greatly appreciated!

I am currently in Thailand, and am receiving long-term medical treatment. I plan to fly out and apply for the DTV in a nearby country in the upcoming weeks.. I am not sure which country would be best for my situation. My questions are as follows:

I just recently (in October) put enough money into my bank account to meet the 500k requirement, but I see that some Thai Embassies may require bank statements from the last 3 months. Is there any country near Thailand that has an embassy that only requires the current month bank statement/balance?

Also, I read on one post that someone's DTV for medical treatment application was denied because the name of the doctor on the medical letter was not on the clinic/hospitals website. Has anyone else run into this issue and what embassy was this at? The clinic where I am currently receiving treatment does not have a website (it's complicated), so I am not sure if this would be an issue.

Once again, thank you for the help!