Agra. No. I am not advocating any such thing.
The only place a non pressurised VFR aircraft flying en route in uncontrolled airspace can collide with a pressurised airline aircraft is in the airspace used for approach and departure to an airport.
That’s why under NAS VFR aircraft monitor and announce on the CTAF when flying in the airspace use for approach and departure to that aerodrome .
So why then would you add the “ cry wolf” problem by making a VFR pilot flying at 5500’ beyond the back of Bourke monitor the ATC frequency that is re transmitted to 30 sectors as far away as Cape York?
Airline pilots don’t even have to do that when en route at flight levels. Most of the high level sectors do not have re transmit from halfway across the country. From my experience in the Citation when outback the high level en route frequencies are pretty quite.