As stated above, this is not possible to do with LVars, HVars and BVars, not in any app. Why implement something that tracks default sim events, when they are no longer in use? In a typical MSFS plane you can consider yourself lucky if 25% of the switches still use the legacy sim events.
With MSFS, finding out what actually drives a button or lever in the cockpit is much more complicated than just finding K: events. Hence my recommendation to activate the MSFS developer mode and to take a look at the model behavior debug feature. That feature is in essence what you are asking for.