The only practical way it could happen is SO's being made redundant from mainline could be offerred FO slots at Jetstar via the MOU.
As far as transferring more A330's to Jetstar, Alan Joyce was asked by the AIPA President about this a few weeks ago and was told categorically that it wasn't going to happen.
Mind you, the LH EBA was being voted on at the time and perhaps Joyce would say anything to get that over the line. That was certainly Dixons style.