I'm confused. China Southern has a direct daily flight from Wuhan to Hong Kong which arrives at 10:35 (Dragonair also flies on Thrusday and Sunday, but not on 22/3 which is a Tuesday). Vietnam Airlines then has a daily flight to Hanoi departing HK at 14:55.

Wouldn't that be the easiest way?

The problem with the 22nd by the way is that is the last day of the CSFB big finance conference plus the HK Sevens Rugby period.