Papyjo,
If I remember it well, QR was advertising for A330 right seat positions for non-rated pilots as well. My point was, for somebody already type rated on the A320, as we all know the conversion would be shorter than the full initial course, and a less restrictive training bond (cheaper). For that, they would need a captain or FO in the same situation than yours to fill in the other seat.
Pure speculation here, but many options could be available depending on the response they get from the ad. All I'm trying to say here is that there would be pilots going on the A330 right seat, full initial or conversion, QR pilots or outsiders.
I hope that helps. Your game now.
Cheers!!