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You could just supply a small bracket with a magnetic switch or optical switch and a tiny wiring harness to read a magnet or black/white lines on the shifter output shaft.. (shaft encoding)
Attach to your unit and the bike with zip ties and a plug. (anyone could handle a zip tie and bolt on mod)
+&- button math in the programming and output display from there. Reset button for failed shifts.. or if the switches are adjusted very tightly probably won't missfire the gear counter cause you shift probably mechanically didn't make it all the way either.
There is also the neutral indicator sensor you can tap in to.
If the gear skips, put in your clutch and shift to neutral (gear indicator is programmed to know neutral via line input from bike sensor) , hit the reset button and then shift back to the gear you were in.
A gear counter reset like this could be performed while moving still and requires no actual speed or tach taps or sensors or more complex programming necessary. A few extra wires down to the shift pedal area attached to a bracket.
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