@Joe ******
pardon me, then I suggest you LEAVE. There's no need to waste your time reading answers that you don't want to hear.
Even Thai Immigration Officers and offices are saying... Leave Thailand and reenter to get your new 180 day stamp.
They really don't want to go thru the multitude of documents which were required to get the DTV visa and have to be updated when you are seeking to get a.180 Day extension inside Thailand.
And the few who have waded through the DTV visa extension process are saying Not Again...
And Thai Immigration Officers are requiring a Thai bank account showing the 500,000 Thai baht balance for 3 full months or more.
IF you cannot open a Thai bank account with the DTV visa, how are you going to show PROOF of having a Thai bank account balance of 500,000 Thai baht or more ???
I suggest you visit your local Thai Immigration office and ask them for their requirements for the DTV visa 180 day extension of stay...
Good Luck 🍀 and please update us on your experience in getting the 180 day extension inside Thailand.