I have 200K AA miles to burn. I would like to go to SYD in DEC (yes I know good luck) DFW to SYD via HKG take CX to HKG then QF or CX to SYD. On the outbound BA to BKK or SIN then LHR then AA back to DFW from LHR. IF the seats are open would this be 180K OW award? Also how long can I stop in LHR or say BKK if I wanted?

Option # 2 If I cannot get a seat to SYD is : AA to LHR (how long can I hang out) next BA to BKK (would be there 5 days or so) then CX BKK back to DFW via LAX AA LAX DFW. Same 180K award? I have flown CX F before never in BA or QF. I would like to try BA if possible

Thanks for any input.