Would it be possible to purchase a 2.4GHz P2 receiver and install it into an FC40, then pair a 2.4ghz Controller to that?
P2 receiver: https://www.rcdepothobbies.com/DJI_Phan ... -rx-p2.htm
P2 receiver: https://www.rcdepothobbies.com/DJI_Phan ... -rx-p2.htm