Just pay for it when you get to AMS and make sure they tag the bike the whole way to YQQ. I have never had a problem with this. Even though you get your baggage in YVR you basically move it over to another belt and get on the elevator. Given the fact you are in J you will get priority baggage (hopefully) and this should help as well. If the bike gets left behind I would suspect it will be in YVR as the Dash 8 to YQQ will be the only space limited plane you will encounter.
Having a Bike is the only way to travel!