Simple solution for JFK base, CX simply base EFP threshold on a 2 month schedule with legal agreement signed by the aoa. If you do 2 months of flying and do 5 JFK flights = 160 hours that averages 80 hours a month for the 2 months. heck they could even publish a 2 month roster
If there is a will there is a way. but clearly there is no will on CH's part!