Not a silly question at all. It is true that AJX & AJV are dominated by Aussies, Kiwis and Septics. There is also a token representation from the UK, Denmark and Sweden. However, both companies also have Asian pilots, from countries such as Korea, Malaysia and, yes, Hong Kong.
There are fewer pilots from Asia than other countries but it would certainly seem that all are welcome to apply and the Japanese do not seem to be biased in theri opinions.
I was told during my interview that they like pilots from the Oceana region as the commute is obiously not as long as those travelling from further afield. However, this is no wasy a show-stopper and has not affected the fact that pilots flying for AJX & AJV live as far east as east coast USA and as far west as Ireland. No harm in applying anyway. What's the worst they can say?