I have tested it and it works. You just need to go to Options/Service and disable “Check if port is forwarded properly automatically.” Then restart BitComet. The light will turn green as soon as the first remote peer appears.
The only problem is that the pop up balloon that appears when hovering the mouse over it still says “Gray Light Your listen port status has not been detected”
Ah, I didn’t think of trying to turn off the check. Forgot you could do that in fact, and was trying to figure out how to generate a “yellow” condition as a preliminary to testing.