I have been operating widebodies into HK for years on 3 different airlines. Neither of them had VMMC as a primary alternate EVER. Secondary, yes. Most of the time, ZGGG or as you said, RCKH. In fact, under one aviation authority we operated in the past, VMMC would have not even been legal (too close to the destination).
I know airlines are squeezing every penny out if their ops and putting lots of pressure at time at the crew. It is a shame.
