That's how i started my 240 for a few months.
Take the starter relay line, and a hot line, step in the clutch, and tap the two wires together, and the car starts.
It's not BS. Doesnt take much to make it work. Just hook up a switch inside the DC outlet, since the cig. lighters have a spring to it, it will disconnect once you let it go after the motor starts. easy shit.