To be honest, I am inclined to say that you'd better forget about the Citroen. I don't think I have seen a Citroen in HK in the last eight years (correct me if I am wrong). You will definitely have problem maintaining it (generally European cars are about twice as expensive to maintain than Japanese).
Given this situation, you will be far better off selling the car, come to HK then decide if you really want/need one.
When I came to HK with my toddler (without a pushchair, thinking of getting one here), I'd decided not to get any pushchair at all but just hold my toddler if needed. This is simply because of the amount of exhaust on the road side. Putting my toddler in a pushchair at that level waiting to cross the road, I might as well feed the exhaust to her like an oxygen mask...