As no one has answered you yet, so let me try and help.
Have you checked the ERSA regarding restrictions on circuit training at Essendon (EN) ? I presume you are flying single engine during your GFPT/PPL training - note circuits are only allowed at EN for endorsement and test flights only.
Does that answer your question, not to mention the extra hire time and fuel to fly to/from another aerodrome for circuit training, and the extra time required for airways clearances to take off from EN and to re-enter its airspace on return ?
That's assuming learning to fly an aeroplane is not enough of a challenge already.