That would be cool! I bet the OEMs do it, at least every once in a while.
It could be inferred from how much current it takes for a given-sized electric motor to spin the combustion engine to a given RPM. A motor intended for small EVs might be ideal.
You would, ideally, want to have the engine parts at their operating temperatures. You could run the engine for a while until it got to operating temp, then shut down the fuel and ignition and let the electric motor go.
This is sounding like something that a resourceful person could do at home...
-soD
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