The principle is the same, isn't it. A kill switch grounds the ignition, but you could wire it another way or use a P-channel mosfet to provide real power by grounding its gate.
My recommendation was based on using something that is essentially already incorporated into the 2.4 GHz TX and RX, rather than hacking into them. Most modern TX used for models have several switched channels that are proportional, but can be set up to effectively be on or off.
Of course, if you are using homemade RX/TX, then that is not the case. Still, there are designs on the Internet for electronic switches based on either short blips or pulse width from typical hobby transmitters.
They are so inexpensive, that I have not bothered to make one.
John