So you can just short out the switch.
I just read the other thread through. While the conclusion appears to be correct regarding starting and running the engine, I don't think all possible issues were settled.
1. If the engine is running and you accidentally push the starter button, I think the starter will engage if the clutch switch is shorted. I'm not gonna test it - that could damage the starter - but I don't see what would stop the starter relay from energizing and sending current to the starter.
2. The function of the wire to the ECU wasn't settled, as far as I can tell. With the clutch switch in place, when the clutch is pulled the wire to the ECU is grounded. When the clutch is out and the engine is running, that wire just floats because it leads to two open switches (clutch switch and starter switch). It seems possible to me that there's circuitry in the ECU that can detect whether the clutch is in or out when the engine is running. This might be used to protect the engine from going way past redline when the clutch is pulled and the throttle is opened wide abruptly. (The same protection likely would be applied when the engine is in neutral, via a separate sensor.)
Because of these issues, as well as speculation on this forum that the switch might be used to activate a different fuel map, I decided to install a separate switch when I installed a CRG clutch lever a few years ago. (I switch it on to start and off once the engine is running.) I've flicked it on and off under a variety of conditions and I don't see any difference in how the engine performs, so I don't think the wire to the ECU is used to alter the fuel or ignition maps. I think it's there to protect the engine from operator mistakes.
I'm not going to remove the switch, but I wouldn't bother installing a separate switch if I were installing the CRG today. I'd just cut off the clutch switch and solder the wires together. After all, none of my previous bikes had a clutch switch, and I never pushed the starter button with the engine running or floated the valves with the clutch pulled in.