Tell the CAD
Can I suggest that if you have a problem with your employer that may contravene the AOC (or spirit of same) you write to the CAD about it. They are our regulating authority and should take an independent view.
You can be anonymous if you are worried about repurcussions from your employer.
Write to:-
Mr CHI -yung Victor
CAD Flight Standards
10F Commercial Building
Freight Fwd Centre
Chep Lap Kok Airport
Lantau
HKG
or
Director General of Civil Aviation
46/F Queensway Govt Offices
66 Queensway
Hong Kong
23624250(Fax)
Up to you really. If you have a point - be prepared to back it up.