Hello nine8six,
when will the sensor and app set be available (in your new shop)? I think there is a buyer waiting.
But i think we would need some data from good and bad engines and engine types to make it easier to identify the right wrong vibrations.
And if that could be combined with the camshaft deviation that would be a very good indicator that something might get wrong.
BTW: knock sensor works the same. But it sits on the cylinder head; so wrong position.
Regards, Markus