Hi again,
Yes, it's good that you're coming to HKG this month -- tell them that when you apply.
I used that tactic when I was looking for jobs (I was living in Tokyo at the time), and mentioned in my cover letters that I was going to be in HKG "on holiday" during certain dates and would be glad to meet them in person. I thought that the companies might be more willing to give me an interview if I was physically there.
It actually worked; two companies said that since I was going to be in town that I should come in to meet them. So I bought the ticket and went to both while I was in HKG on holiday.
Actually, I did not hear from them after that for quite a while and thought for sure that my application didn't make the cut. Almost 3 months later I got the email from one company (where I'm still working) with the job offer. I guess these things take time. Found out later they had offered the job to two other candidates before me!!! But, I guess it was just my lucky day.
Another word of advice -- if you get offered an interview, hope you have a really nice suit. People in HKG, especially in the business district, dress to kill. Make sure you dress to impress.
Oh yes, and in your applications, if you lived or studied overseas, make sure to mention it, especially if it was an English-speaking country.
If you have more questions, feel free to ask! I spent a lot of time on geoexpat as well before moving here so I'm glad to help someone who was in the same position as me not too long ago.