As long as your ZED is a non-Star specific one I don't think you'll have a problem at all. TG & CX both run 5 widebodies a day each and there are other numerous carriers operating over the route each day - GF AI EK UL KQ KA and CI.
Just make sure your ZED covers as many of those carriers as possible - including Kenya Airways! Their 767 service nearly always has seats available on it and they run a very, very good operation. Certainly worth it for the novelty value if nothing else !!
Don't rely on the Star ZED as that limit's you to just 5 of these flights only.

TG 600 BKK 08:00 HKG 11:45
CX 700 BKK 08:20 HKG 12:10
CX 708 BKK 09:50 HKG 13:40
GF 150 BKK 10:20 HKG 14:10
TG 628 BKK 10:30 HKG 14:20
AI 358 BKK 11:20 HKG 15:20
CX 750 BKK 11:30 HKG 15:20
KQ 230 BKK 12:25 HKG 16:20
UL 422 BKK 13:10 HKG 17:00
EK 384 BKK 13:45 HKG 17:40
CI 642 BKK 14:45 HKG 18:45
TG 630 BKK 15:30 HKG 19:25
TG 606 BKK 16:00 HKG 19:45
CX 712 BKK 16:10 HKG 19:55
CX 702 BKK 18:40 HKG 22:30
TG 602 BKK 19:00 HKG 22:45
KA 283 BKK 20:15 HKG 23:55