So, to update this thread, here's what transpired:
Went to Buakhao location. First in line for the desk clerk. (I like this location because they seem to speak English better than my experience at Klang, but it's been 5 years)
Anyway she tells me to go to a counter clerk to close/transfer, but then realizes it's the Klang location so I must go there.
I scooter over to Klang, and indeed, as @treetops posted, it's still open. Busier than the Buakhao location, I get a ticket for one of the desk ladies as I also want the face scan done. Long wait... Then she tells me, in better English than 5 years ago, that I need to go to the counter, but she can do the face scan. Her camera doesn't work, so we interrupt the 2nd desk clerk to take my picture. I don't know if this is what I'm looking for, ie the scan required to xfer more than ฿50k from my phone, but whatever. (Other falangs were getting their personal phone cameras zoomed in and out on their faces, but I just got a pc camera pointed at me, so not sure.)
I go to the counter, where she closes my account and transfers, hopefully, my 800k to the US. Says it'll take a couple days, so here's hoping.
I mention the English speaking, not to be an ass, but because it's truly appreciated. I'm in their country after all.
Still have 300k in BB savings that I have to move, share, party with, or whatever.
I'll update the thread one last time once the money hits my US account.