Successful Non O to A one year extension granted today at Phuket with the embassy affidavit from Sept. 2018. Wasn't sure if it would be accepted as I couldn't apply until now (30 days before expiration of Non O), but all is well.
TLDR : Answer Summary
A user successfully transitioned from a 90-day Non-O visa to a one-year extension of stay in Phuket, using an embassy affidavit from September 2018. There was initial uncertainty about the application process since they could only apply within 30 days of the Non-O visa expiration. A comment noted that the O-A visa is typically obtained before entering Thailand, but congratulated the user on their successful extension and reminded them to acquire a re-entry permit if planning to leave Thailand during the extension period.
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