Bear in mind that because this is a 2 crew normal ops flight we can extend the duty by an additonal 3 hours through the use of discretion to return an aircraft to HKG.
Bollocks! With one exception, Discretion can
ONLY be used to extend an FDP in the event of delays
AFTER the FDP has already commenced. The exception applies when the required number of pilots is reduced from 4 to 3, and is not applicable in this case. Discretion
CANNOT be scheduled to enable this kind of operation, as you are suggesting.
By the way, while a 40 minute turnaround might be perfectly achievable in TPE, I would suggest that achieving the same in BJS is an entirely different kettle of fish.