Maybe a receiving chute? Small, portable, and a clearer indication (cannot be confused with a yawn), plus it'll open up the variety of comestibles you can purchase just s mouthful of. No more forks, no more spoons, just a little sloped thing to slow and guide

Perhaps small guided parachutes that receive an auto-correction location from the RPi and track the mouth? The issue is that the gum will be expensive.