If necessary, that wouldn't be too hard to do, Simon. Electric bikes use a 'Hall-Effect sensor' that reads a magnet attached to the chainring for pedal rotation. That's used for the ' 'PAS' Intelligent Assist' systems, which apply power only while you're pedalling.
A small black box with sensor input and a micro-controller switching a high voltage transistor to disable the ignition would do that fairly easily. A (very) small, on-board battery would be needed, though. Hopefully, that could be trickle charged on the negative half of the white wire output.
(Before I retired due to ill-health, I owned and operated a small electronic design business for many years. I have all the gear here to design and build the above controllers, if they become necessary.)
If the problem arises, we'll cure it. Your 200W RSE engine is safe, I'd say. Ignore naysayers such as pedalless.
