I am planning a DONE4 which will include SIN-HKG-DPS-HKG-NRT (then onto MEL)

To maximise QF status bonus, I want to fly on AA/QF/BA flight numbers rather than CX where possible. I know that AA codeshares on the CX flights SIN-HKG and HKG-NRT, but looking at the AA website I'm confused whether my routing allows this. From what I've found it seems that these two codeshares are only allowed if you are connecting thru to the US - hence I would not be able to use them.

Is anyone able to confirm whether I can use these codeshares (or if there are any on the flights to/from DPS)? If there's no codeshares on the DPS flight, are there alternatives with codeshares also over the 1000 mile mark (Seoul, Beijing...)?

Thanks