I have a QF LH LH QF booking (D class on QF, Z class on LH). This will allow me to get QF miles and UA miles (through LH). I expect I'll have to alter my FF number in the reservation when checking in for the LH flights, and then change it again to the QF number for the last flight.
My QF WP number allowed me to get a seat in the 744 Zone A (sold as 2 class on 4 class aircraft)

. For my homebound QF flight, I will request a F upgrade when the 90 day window opens.
Now, after I put in my QF upgrade request, will my place on the waitlist queue change (or even drop out) if I change my FF number in the reservation to that of (in my case), my UA number?