You're lucky as both HKG-NYC and HKG-LHR-NYC will yield the same 90,000 AM required.
While West coast America/Canada cities don't get the same treatment.
- HKG-LAX, 60,000 AM EY direct
- HKG-LHR-LAX...will require 110,000 AM even if you don't mind travelling for 24+ hrs.
- HKG-YVR, 60,000 AM
- HKG-LHR-YVR, 110,000 AM
- HKG-JFK-YVR, 110,000 AM
I would warn you though, the amount of tax and surcharges you'll be paying on your itinerary will be quite high though as you have BA/LHR involved.