I'd like to have electric drums on my up and coming home build. I would also like to have a 416 style e-brake. I haven't had much luck looking online. The only other option I could think of is using a trailer breakaway system. When I need to lock up the wheels without being attached to the tow rig I could just pull the pin that activates the brakes. Of course this would only last so long because of the battery that activates it. But for when I need to e-brake it for a long period of time I would just use Wheel chocks.
However I really would just like to have an e-brake system just like the 416's but also be able to use a brake controller from the tow rig for normal braking. Any way to retrofit a lever and e-brake system to normal electric drum brakes?