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I imagine the keypad itself may have its own integrated circuit that tells the LED which Nos to form. It may be possible to run a jumper from the Amphenol power plug socket in back to wherever on the keypad to produce numbers in the keypad screen. If not maybe a cheap calculator guts...
While laying about recovering from back surgery, I found this RT-1523C-type trainer radio demil housing on ebay:
The faceplate is accurate, with 3D molded features instead of laser engraved onto alu plate markings. The 30ohm Antenna Mount is face, easy fix, the HUB battery cover is molded...