5300nm still wind, figure about 5700-5800 nm ESAD westbound.

763ER could make it with a full pax load, no cargo.
764 could make it with almost a full pax load and no cargo.
777A could make it but with only about 240 pax and no cargo.

This is just using the Boeing planning docs. I'd guess you'd end up blocking a lot of seats with unfavorable winds, unsuitable diversion points, etc.