Not an Aussie or even an expat so I can't give you first hand experience but I'm thinking ID90s would be the way to go on this. The only flights we're doing down under the moment are for a certain Kangaroo branded airline and are frequently delayed for various reasons (sometimes problems on our end, sometimes at the request of the customer). I wouldn't want to count on them being my ride to and from work. I would think your best bet would be to ID90 somewhere we fly in Asia and catch company metal to ANC (possible issues with COVID restrictions depending on where you tried to make the connection) or ID90 somewhere in the US and get a company paid ticket to your base. Going back to Australia, most of those flights are going to pass through ORD or LAX before going to HNL and SYD (with another possible stop in Australia/New Zealand) so it should be relatively easy to end up someplace to catch that company metal back home but again, those flights are chronically delayed. Since the flights don't always run daily you may be giving up more days at home doing it this way.

The expats can teach you all their tricks and secrets on how to work with scheduling and travel to make your life easier but so far as getting to and from the US is concerned, my opinion is that company airplanes are not ideal in this case.