I've never been involved with the club, but knowing people who have - the general consensus is that if you've any desire to learn to fly, then do it elsewhere! Doing a PPL the CAD way at the HKAC will take you ages. The cost per hour and the time you have to spend relearning the previous lesson due to lack of continuity makes it a very expensive and frustrating proposition.
Take time off and do the PPL in the US/Canada/NZ/Aus/Thailand/Philippines. You can complete it in a much shorter time and probably have much more fun while doing it. The conversion to the HKCAD PPL will take a bit more time and expense, but when you've started to deal with the CAD, you will probably give up the thought of flying in HK anyway and decide to stay current on holidays to wherever you did your PPL.
The HKCAD, the PLAAF and the HK weather aren't conducive to fun flying!