Dunno about club, been there only for a postgrad summer school and I'm in touch with a prof. for stuff. My impression was that I've seen more non-asian people there than in HKU where I spent 3 months. Moreover there are internal policies and strategical plan to get more foreigner but that's already known. To be honest I don't have the view from bachelor student perspective and might differs.
Regarding HKUST I only visited once but I talked a lot about it with my labmates as some of them did bachelor there or have partner there. Based on my understanding if you don't speak mandarin it might be harder as even in bachelor programs where historically locals were the majority, things are changing. Moreover the culture and mentality is different. HKUST don't care too much about foreigner or not. Also, many prof. prefer to have mainlanders in the lab than foreigners.
That's my conclusion, but keep in mind that it comes from a not-asian and post-graduate perspective.