And your point about affect ability to move easily in the future. Yes if you were offered the position with Cathay at the end of it then yes you have to accept that you are there for the long term.. But I think you're jumping the gun a bit here no? That's like jumping into bed with a girl and saying the next morning "so when are we going to get married then?"
I'm saying go for the interview because you might find it goes really badly and you see areas you can improve on for future interviews! Or could give you more confidence, you don't have to take the job if they offer it..