Re the video:
-) yes , a great idea , thanks for sharing!
-) seeing the piston's movements, I guess this is a so-called constant-vacuum carb, like the Bing 55's commonly found on 4-stroke Rotaxen - they have a piston, controlled by venturi pressure, but they also have a butterfly valve, controlled by the throttle. I can't imagine any pilot in a more or less normal state of mind to operate the throttle in the rhythms we can see this piston practicing.