Wow, that title sucks, but I couldn't think of a better one!

I have a ticketed RTW. My QF FF number has been recorded, so if I do nothing the points/SCs should end up in my account.

Now, the issue is that I have been convinced by a certain Mr Noble that it would make sense for me to do the AA Platinum lack-of-Challenge. At the risk of sounding like a recently banned member I have a couple of questions:

1. If I change the FF number on the reservation now to my brand new AA FF number, is there a downside? For example, currently when a QF boarding pass is issued to me it shows my QP membership. Obviously if the AA number is in the system this will not happen. Can I still access the QP by showing my QP membership card and boarding pass?

2. Would I be better off getting boarding passes with the QF FF info on them and getting the staff in the QP to change the info in the computer?

I really don't want to risk being refused entry to the QPs in CBR, SYD and LAX. On the other hand, by my calculation my CBR-SYD-LAX-IAD flights (booked in H class) will just get me to the required 10,000 Q-points, so I can't afford to make a mistake.

Any input would be appreciated.

Alan.