Don't really understand your problem
In 10,000+ hours I have never landed in a wind gusting 50Kts.
Thats 60 mph .. the average person would be at risk of being blown off their feet.
The mere fact the wind is 30G50 means the windshear will be at least +/-20Kts ... our ops manuals stipulate an airspeed deviation of +/-15Kts is a trigger for a WS GA.
As for HKG specifics - Didnt Virgin almost loose an aircraft in there with low level windshear some years ago.