For others reading post this you cannot get an extension on a Visa on Arrival (VOA) which gives you 15 days on entry. The OP has a Visa Exempt 60 day entry stamp which is eligible for a one-off 30 day tourism extension.
No, you cannot now get a 12 month multi-entry Non-O giving you 90 days each entry. The only Non-O is now 90 days then get a 12 month extension of stay.