I wanted to do something more direct like that originally, but every mock up I tried, I ended up getting false positives in one direction or another (ie trying to trigger just a nudge left would often inadvertently trigger both a nudge left and a nudge right with all the mechanical designs I could come up with).
Thing is, the latest future pinball actually has a nudgex nudgey option (i'm guessing to feed it analog input from a stick or accelerometer, but I'm not sure yet, just happened to notice it on the config screen).