I need visa to see Hong Kong. Can I apply HK visa in Melbourne, Australia?

I have Pakistan passport but living and working in Netherlands since 3.5 years and have valid Dutch Resident Permit. I have Australian visa as well and now I am in Melbourne to present my research work in IUGG2011 conference. I have Cathay Pacific return ticket, which will have a stop-over at Hong Kong airport for about 9-10 hours and therefore I need visa for Hong Kong to see it. Can I apply in Melbourne, Australia in Chinese embassy and how much time it will take. Can you please further advise me, which visa type is applicable to me.

My regards,
N. Alam
Delft University of Technology, Netherlands.