that's true...you don't really need to keep Emerald in 2 programs...except, if you're CX Diamond, as you said, you get guaranteed business (and economy) seats (it's 24 hours prior to departure though, not 48)...and probably, access to CX lounges even when not flying CX...otherwise there's really no additional benefits...

but you're also true on the AC side...now that they no longer have the 28000 miles for 8 any-distance any-fare international upgrades, there's less of an incentive to keep SuperElite...

the 8888 promotion started on June 19...so I think your flight on June 17 would not qualify even if you are a HK resident...I didn't receive any information in the mail either on this 8888 promotion, just read from the local newspapers...

since you have 2 addresses on file with MPO already, why don't you add one more HK address (you can use mine if you need one), and tell them this is for "bonus purpose"...

representatives of The Club service center...not sure, because I usually talk to the Cantonese-speaking ones...