VH - xxx:
VH-XXX The simple solution for you then is to purchase a TSO'ed ASI and Alt. Easy. Worst case, a second hand one from a broken Cessna or similar. Compasses are 2 a penny as they say.
I'm not sold on the radio being TSO'ed though as potentially 40%+ of the Australian aircraft fleet including RA-Aus have non TSO'ed radios.
TSO'D gear will be purchased.
If 40% of the fleet have non CASA approved radios, then 40% of the fleet are breaching CAO 108.34.
http://www.casa.gov.au/download/orders/cao108/10834.pdf