Not on his line of thinking, but it is an excellent idea.
Why not have every NPA publish the radio height at 1000 height point (or equivalent). Alive serious.
The final report will not be nice reading. The RA autocall 50, 30, 20 or de-configured (why!) and the RETARD call too at 10.
BTW I recall a training session going very wrong and causing a similar situation. Under workload the orange RA lettering did not deliver the message. The 100 RA preceding 100 above surely did.
The event is exactly verbatim what the CAA.UK document linked above warns about. Also with the explanation why EGPWS could not pick it up.