Unlikely to be a modification to the approach as the RNP AR with RF leg is not permitted to be modified.
And generally once ATC (in Australia) clears you for the approach they will expect you to do exactly as it says on 'the tin'.
As I said this is flown in NAV/DES and there is a whole section in the FCOM about how to fly these approaches; which we are required to have a look at as part of the arrival briefing before TOD. Personally I don't like the NAV/DES way of doing it and I have seen finger trouble with these more than once!