What do you mean by "as wasn't branch opened account originally" - do you mean you requested it at another branch? If this was for your first 12 month extension then you cannot use the 65k transfer method anyway, you must have 800k seasoned for 2 months as the British Embassy does not issue the income affidavit.
Yes, it is a risk following your previous warnings as airline tickets can be changed so this is how your departure flight could be seen. It is no guarantee that you will indeed leave Thailand well within the 60 days.
Airline tickets can be changed so, in your case, this is how your departure flight could be seen. It is no guarantee that you will indeed leave Thailand well within the 60 days.