My favourite snacks :-
Chopped Up Savaloys/Hot dogs/Sausages
Olives
Cheese cubes
Small chopped salad
Sliced meat or cheese on matsu crackers or melba toast
Sliced Chicken
Chicken drum wings
Cubes of tinned pork or luncheon meaat
Celery filled with cottage cheese
Handfuls of mixed seeds (not sure w.r.t. nut allergy)
Boiled Eggs
Pickles
Garlic mushrooms (unbreaded just plain fried)
All the best