So in Australian airspace radio failure procedure can be found in AIP ENR 1.1para 21.2.8, basically
a. squawk 7600...not that difficult,
b. broadcast blind at suitable intervals e.g. call sign position & intentions,
c. look out for other traffic & monitor TCAS if fitted,
d. max exterior lighting on,
e.maintain last assigned speed & altitude for 60 mins & thereafter speed & alt as per flight plan.
As I mentioned earlier I think that flying into BNE, SYD or MEL in an RAA a/c isn't going to happen due to congestion, however the secondary controlled airports with very limited i.e. 3-4 RPT movements an hour no problems, yes I want to be able to transit Gold Coast coastal or via the western VFR route, the same goes for Coffs, both these airports will force me over tiger country to remain OCTA hardly the safest option.