I was wondering if there were other legally recognized (valid for work permit) positions available to foreigners at public schools besides being a teacher?
Nope. It's essentially just verifying that the diploma is from an accredited school, as far as I understand it. Why it takes so long is beyond my comprehension.
Has anyone had any experience receiving an equivalency certificate from OHEC for a diploma in Teacher Education?
I sent out my application paperwork in June, with the assistance of a Thai colleague, and they are still processing the documents.