I found QF seats using KVS but had to settle for HNL-SYD-LAX-SEA... would love to be corrected and find out that I can add in the SEA-HNL leg (and a bit of an HNL stopover

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Well, if you have 12.5 K AMEX points, or other means of transferring (Marriott and so on), you can transfer them to BA Avios and for 12.5K Avios, get an AS Y flight SEA-HNL on a separate ticket. (BA has a distance based chart instead of the charts where American carriers charge extra mileage for Hawaii.)