In current INO pwm2 is controlled just as required (when motor driver set as Cytron) , 5V when steering active, 0V when inactive.
So, it’s really a very simple setup, just carefully remove the two components and connect a wire from the nSLEEP pad to NC in connector. Easy to connect to pwm2 in pcb with the included grove cable, no extra components and wiring needed. Just tested and works like a charm.