Hi guys. What's the best method to do a plug chop on a modern CVT vespa?

On a geared scoot, you run at WOT (very high RPMs) in 3rd or 4th, then simultaneously pull the clutch in and hit the kill switch to shut the top end down and get a snapshot of the ignition temperature under those conditions.

But, with a CVT, you can't really control the rpms as well except for running full bore at top speed (which isn't necessarily an appropriate city road speed...). PLUS, there is no way to nearly instantly disconnect the wheel from the top end when you hit the kill switch, so you can't get as clean a reading of the ignition temp at that particular load and rpm.

Is there a trick to it? Or are we just stuck with a sloppy reading?

I'm considering kitting the ET2 to a 70cc, and want to make sure I get a good jetting on the scoot.