No choke servo on my BME 50 setup. I used a short piece of wire thru the cowl with a ball link on the choke arm.
Normal engine kill is low throttle and low trim (just like a glow engine).
Emergency kill is with an electronic switch in the ignition line (as mentioned in post 10), I'm using the rc-100 switch from RCAT Systems. Around $20 and weighs almost nothing. Plugged into the retract switch channel.
Works well with no problems.
I did however install a choke servo on my ZDZ 80 in another plane before I found out about these e-switches. That works well also.