Hi Kevin
In your shoes, I would consult Alan Collett of Go Matilda because he is a Chartered Accountant in both jurisdictions as well as a Registered Migration Agent.
Never having been anywhere near accountancy myself, I have no idea what the pre-qualification training period involves. However, Alan comments regularly that a fledgling accountant's training frequently involves doing the same job as s/he will do once qualified and that sometimes it is possible to convince DIAC and the skills-people that this work experience should be taken into account.
That is all I know about it, but you can conact Alan in a variety of ways. You can pm him via Poms in Oz, or you can e-mail him on
alan@gomatilda.com
Alternatively, he is in Melbourne so you can contact him by phone if you prefer. Please see this link:
Go Matilda - Your Gateway to Australia - Contact and Feedback
Best wishes
Gill