Hi FastDoc98,
I used one of those servo-actuated micro switches on a magneto ignition Zenoah a couple of years ago, and I assume it could be made to work on an electronic ignition, but I would recommend not using one since I've heard of many failures recently.
The two solutions I recommend are either the Electrodynamics(
http://www.electrodynam.com/) fiber optics switch which is designed for electronic ignitions, but is expensive at $60, or a choke servo which then serves two purposes.
Bill