I think the modification would be better is to modify the LED board inside the mirror only, because the I like the OEM Trail boss mirror, so the change only with brighter LEDs.
I have came with an idea that is to remove the cover and add your own LEDs whatever you want and remove the old one and put a switch for them so you can switch it on and off from your own switch ( that's mean whatever gear you are in ) with brighter LEDs.
For now I have done the switch thing. But I think after testing the OEM in the offroad it would be better to change the LEDs.