Converting the options is very simple, you can email the company...

Converting the options is very simple, you can email the company for the form (the form is very simple), fill it out and email a copy back & pay the conversion amount into the bank account listed.

I'd think the company would be best to answer any specific queries, especially with your situation being overseas. I assume there won't be any issues (other than probably needing to pay in AUD which may be a hassle). I think contacting the company would be best and they should be able to help clarify.