If they crew this from o/s it may be a different story but I'm not sure they'll get many Aussie crew wanting to live in Singapore if they're offering J* T&Cs. There is a rental boom in Singapore at the moment with a four bedroom place in an average part of town (most Captains would need somewhere close to that to sort out the kids) going for $7000SGD a month. That price is expected to rise again by the new year. It was $6000 just three months ago.
Even with Singapore tax that's still a big first bite at your take home dollars. Of course it may suit the F/Os who will probably have four crew to a place like that.
Of course they may be inundated in the short term by people who want the 787 stamp in the log book and then are going to go and move on elsewhere.