Green with Blue tracer is brake circuit on earlier cmx500 models, I don't have 2021 wire diagram..
there are multiple connections to the circuit as it is connected to the ABS modulator as well..
I would be very careful cutting into computer controlled wiring systems.
This forum is focused on 1st and 2nd generation Rebel through 2016..
3rd gen Rebel owners congregate at
www.hondarebel3forum.com