Hello dear :)
Welcome to the thread!
If I remember it correctly, if you didn't practise for that long then you will have to take a return to practise course - not sure if it applies to IEN. Either way, you will have to go thru the Bridging Program or worse, they'll ask you to take a different course. I am sorry I am not that knowledgeable on your case. But! If I do find something related to your case, I'll update you!
As for the courses in Australia, degree courses are on the expensive side having 15k AUD minimum tuition per year. Diploma or Trade Certificate courses are however half the price which usually costs roughly 18-20k for 2 Years. You'll find some other cheaper courses below that price but of course, I can't tell you if the school is that good.
The people I know took Courses leading to being a cook, hairdresser, IT related, accounting, welfare worker, etc.
Please refer to the link below for the full list of nominated occupations that you should check and the corresponding assessing bodies where you'll find the required courses for each: