I agree with JT that you may be best trying CJC first. You may get a quicker result.
NCAT fees are below. From my quick look it appears that the fee would be $101 unless you are entitled to a discount.
http://www.ncat.nsw.gov.au/Pages/apply_to_ncat/fees_and_charges/fees_and_charges.aspx
Being that your case is a ‘novel’ case i.e. an issue that has no precedent as yet, it may be worth your while seeking expert advice. You would probably be very cross with yourself if you lost your case over some small issue that you may have inadvertently overlooked.
If you lose your dispute then your safety netting may need to be removed …. a outlay cost that you would have ‘wasted’. And your children’s safety would again be at risk… and you can’t put a price on that!
Its your decision but if it was me, I would opt for legal advice. Give yourself the best possible chance of winning.
Dr Sherry’s advice is very good advice!