I would advise to refuse to sign as a group.
What are they going to do , sack you?
Will they outsource the whole 737 fleet with people paying to fly?
I can imagine that they will get some people out of GA or the corners of the world who will pay but, will CASA approve it and, with Tiger's record?
Who is going to run the fleet, a guy with a bare endorsement with no heavy time, management experience or check approval and a Permit to fly on a foreign licence?
That would be a right good way along the road to being shut down again.
Why is it that these Lowcosts make decisions based on less than the best processes and then want to cover the possibility of having their incompetence been exposed by getting the little people to pay ( or take up some risk)?
Probably better chance of getting job somewhere with an Airbus 330 Rating than a 737.