Unable to set Tail Number on some aircraft

I’ve managed to ‘permanently’ change the Tail Number / Registration number across most of the aircraft in MSFS2020 by editing the aircraft.cfg files and changing the atc_id tag as advised in various posts online, but it seems a number of aircraft don’t have an aircraft.cfg file.

The DA40-TDI is one example.

I have tried creating an aircraft.cfg file in the same place as this config files lives for other aircraft and have recreated what I believe is the relevent part of the file, but it’s still not changing the Tail Number.

What I’ve created is:

;===================== FLTSIM =====================

[FLTSIM.0]
atc_id = "M-YTAIL" ; tail number
atc_id_enable = 1 ; enable tail number
atc_airline = "" ; airline name
atc_flight_number = "" ; flight number

This is being placed under the official folder rather than under the community folder – I might try the community folder at some point.

It has been suggested that the Premium aircraft don’t have aircraft.cfg files as part of the copy protection, but I haven’t been able to confirm that yet.

Has anyone managed to change the Tail Number on the DA40 or any of the others without aircraft.cfg files?

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UPDATE

I’ve tried putting the new aircfraft.cfg in PackagesCommunityasobo-aircraft-da40-tdiSimObjectsAirplanesAsobo_DA40_TDI but still no tail number change. I’ll play around with the sub-folder structure, but it would be useful to know what the structure is for community aircraft.