If they want efficiency and safety then all they have to do is roster JFK based crews to do a SIN or CGK through the night flight on their layover in HKG. Efficient and right on everyone's body clock. You'd be approaching 80 hours every month by doing two trips a month from JFK.
The company has already stated they are increasing frequencies, including a 2nd through the night flight out of SIN and a SGN redeye.