Hi oilfarmer,
Forgive me if this is a silly question but as you have been helpful to others here re converting options, I'm assuming in your case its not just a simple matter of confirming your name/address/HIN details held on file with Security Transfer Registrars and zapping through BPay...?
Not speaking from personal experience but I am aware of certain occasions where options have been converted up to one week after the expiry date, so although I don't have the answer, extraordinary circumstances must provide for exception to the rules.
Have you tried contacting Chris Watts at POK or calling the ASX?