Just throwing out here, even tho I don't work radio anymore for a job.
Blue skying?
Tone Remote Control generator with at least F1, with PTT, maybe an F2 tone, of course adjustable tone level.
Tone remote decoder, with level display and FT decode and pass/fail on level. Really slicker than snot would be displaying parameters like HLGT Freq, level & correct timing, FT freq. level & timing and LLGT, similar.
Course, even tone remote circuits are supposed to be going the way of the dodo.... telcos are supporting them, not taking new orders, etc.
Yup, SINADDER & Distortion meter.
Kinda like a specialized TIMS, but specifically for two-way and Tone Remote trouble shooting. Most TIMS I've used in the field are not quick enough to capture and characterize the FT operation from the far end. Really cool? O'scope capture & display.
a
At least a DC Remote current level decoder?
I've been working in industrial process controls lately, dealing with 4 to 20 mA loops; have a Fluke meter that decodes 4 - 20 mA in the loop, non-intrusively, with a clamp on current sensor, and can also source 4 to 20 mA to imitate a process control command. Pretty cool operation.
