I'd give him a tiny spoon or fork and keep at him to take one bite and chew ... IME shoveling tends to be caused by either fear, either real aka been underfed to his fullness factor at home or perceived aka look at all these people there might not be enough food for me , so woofing down to get enough OR there is actually a condition where the nerve sensations are not developed in the mouth properly and they just cannot TELL their mouth is full or more accurately by the time the fullness sensation gets to the brain and back to the hand to tell it too stop another three bites have gone in

Either way they need us to show them there is LOTS of food so no worries slow down and enjoy and help control the one bite at a time and chew it all up.