Hey anonythemouse, re-read my previous post, there are no IFR twins based in Perth (except for the copper's BK, but you won't get in there, and the CHC Rescue 412, even less chance of getting in there). Suggest you direct your effort at getting an instructor rating, because that would get you much closer to the front of the job queue in Perth than an Instrument rating would.
Or for a guaranteed job for $80K, get your bus drivers licence (the bus company will even pay for your training).