You wrote:

You need a boarding pass for a same-day departure from SYD in order to get to a lounge. You must still clear immigration and customs even if you have no checked baggage, you cannot stay airside (at least not without being arrested). All the lounges are on the wrong side of security, hence the need for a boarding pass in order to get to the lounge.
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Number_6:

Not what I wanted to hear, but now I can stop trying to figure out how to do it.

Thanks.