Earlier quoted context omitted.
I was concerned about this very thing when I was preparing to immigrate to Australia. In the end, because I had a job offer I got in on a 457 (good for 4 years) and didn't have to pay the ACS' accreditation fee. Even better, in 6 months when I apply for Permanent Residence I still don't have to pay the ACS because I've been working here for 2 years.
I am not sure this holds.
"Temporary Residence Transition stream
If you apply for the Temporary Residence Transition stream, your skills do not need to be assessed because you have already worked for your nominating employer for two years in Australia.
You must have at least vocational English.
This stream is available only to people who hold a subclass 457 visa. People who hold other 400 series visas may qualify to apply for a permanent residence visa through the Direct Entry stream."
[1] http://www.immi.gov.au/skills/skillselect/index/visas/subcla...