Can I use domestic bank transfers to meet the Non-O visa financial requirements in Thailand?

Nope

nope, domestic transfers are not accepted for proof of funds for monthly income method for the people whose consulates here do not issue the affidavit of income from abroad notary letter.

You would have to transfer a minimum of 65K baht in from abroad into a thai bank account in your name only, each month every month for the preceding 12 months before you apply for the next yearly extension

AND

You would also have to follow the current extension money seasoing requirments of keeping the balance at 800K baht for 3 months after the extension was granted and then never letting it go below 400K baht the rest of the year