For ICUS you must be appointed by an operator. Two mates (without the blessing of an Operator) cannot just go log ICUS. I'm no instructor but I imagine that in Aus (not so in the US I believe) one cannot log Dual unless operating under the auspices of an approved flying school. Without an AOC holder it looks like you'll be stuck with doing 3 hours per 90 days.
FRQ CB