Dick,
Reality check required again .....
- Transponder use is NOT permitted to be used as a risk mitigator in this scenario ! So that is removed from the equation.
- Therefore, in the proposed Class E airspace above Broome, there will be LESS protection from VFRs than is now the case ... FACT.
N.B: Remember, we currently have a mandatory broadcast requirement for VFRs near Broome.