For goodness sake...........
I appreciate the controllers helping me when they ask me to establish at whatever distance.
The ability to do so may be type related but the VAST majority of modern a/c can easily achieve what the controller wants with NO problem!
Extend the centreline from the CentreFix then use LNAV /ManagedNav until within 25nm (UK) then arm approach!
.......OR we can complicate everything to destruction?