What if you tried disconnecting the wiring from the motor?
If you're going to re-do the wiring, be aware that you may have some semi auto problems if you combine the KA trigger assembly with a reinforced tappet plate. The problem I had was the carriage in the trigger assembly wouldn't disengage properly because it was slightly enlarged and the tappet plate was reinforced. The reinforced tappet plate didn't give it enough clearance to disengage properly. I had to sand them both down slightly to make semi auto work.
Guardians of Asgaard - KF32
VFC H&K 416C
VFC KAC SR16 JL Billet SBR
TM FN Five-seveN