I can't believe that there isn't one union, sounds like Qantas set this one up. what's wrong with you guys? don't you believe in looking after yourselves?
Every Flight Attendant I have met has appeared to be intelligent but allowing a company like Qantas do what they do to you seems like stupid and selfish behavior.
Create some solidarity, all join the unions and create some strength amongst yourselves. Then you can force the unions to work for you, maybe even unite.
A strong union can create much better working conditions for you and remember, a plane with passengers cannot fly without trained cabin crew.