>First of all, you need to convert to Canadian license which takes some time and money.
Actually, it doesn't cost you a cent and takes no time at all -- IF you get on with CX. With a Canadian ATPL, all you need to do is write four HK CAD exams. The fees are taken care of by CX as are all the exam registration details. And they provide you with a few short courses and notes that WILL prepare you for the course. All this is done within the first two weeks of joining. You'd be surprised at how little effort this takes.
>Second, the pay in Canada is not that great.
If you are not already in the seriority list of a major Canadian carrier, I'd say the starting pay with CX on the North American freighter operation is pretty decent -- better than any major Canadian carrier's starting pay.