Can you get Premium Economy classed as "Y"? Just a thought...
Can't help with your specific questions but wanted to extend an early "G'day Mate, welcome Down Under"...
Be careful though.... an ex-RN Commander I worked with in our Navy had originally come here on a 2 year attachment... when it came time to return to the UK.. in his words..
"I couldn't get my wife out of the vineyards or my kids off the beach!"