Who said anything about not having CTA/R where mountains and radar exist?
Are you aware of any locations without radar and CTA/R [with RPT traffic] that you consider should be radar equipped CTA/R?
Have you asked the CASA to assess these locations for Aerostudy and related processes? What did happen to CASR Part 71?
You know why I'm asking, because a properly conducted aerostudy would assess real traffic, topography, and all other complexities as per regulated procedure, and then apply the classification that addresses the risks to an acceptable level in that location.