As I know from Bangkok a bus available from operator which charge 1250 baht including all, bus fair, refreshment, Myanmar visa fee. I will search name and comment in a while.
Thanks David K CH. You are right. I too listen same. Kolkata jest started to issue all type visas.
Kolkata just middle of my station n Bangkok approximately 2000+ km. I try in Delhi. Many Indian people on non OA visa in Bangkok but I unable to contact them.
I have complete formality as per Thai embassy Only confused about enclosure copies because we get only one copy from doctor or police n banks.
Thanks again friend. I update later whatever progress.