I have succumbed! I am now on the 2045 BUD express, staying at the Ibis Styles BUD airport.
My original booking has stopover in at HEL to avoid band 3 UK APD. But a few more award seats had opened up recently thus providing the opportunity to revisit and have a stopover at HKG. So I checked things out - my stopover quota for the oneworld classic award had been reached. Removing the HEL stopover and booking LHR-HEL-HKG increased APD by £89. Strangely enough, the basic fare on the BUD express was £89. So have open jawed to BUD-HEL-HKG and booked a separate fare on BA870 to BUD. Cost was 5k points but I received a AUD119 refund.
My routing is now:
Code:
MEL-DRW
DRW-SYD-SIN-HND
HND-SIN-KUL
KUL-LHR
(LHR-BUD)
BUD-HEL-HKG
HKG-MEL