I wouldn't get worried about multiple applications! In the last round of recruitment (even if it was 8 years ago) people were offered mainline interviews/positions after initially applying/testing for qlink. Wanting any job in the QF group looks good.
The sad reality group airline applicants don't seem to acknowledge is that your chances could be less purely because you are in a subsidiary airline that needs crew too. Some make it across to prove you can but there are heaps of external to QF group quality applicants that don't leave a hole in a subsidiary to fill.
Good luck to all that apply. You won't regret it.