Combine sweet and spicy cheese sauce ingredients in half hotel pan. Cover and heat in steamer to 165°F. Hold warm.
Split and open hoagie.
Lay four slices of chicken ham on each half of roll.
Top each hoagie half with two pineapple halves, four halves total.
Drizzle 3/4 ounce sweet and spicy cheese sauce over pineapple and ham.
Sprinkle with 1 tablespoon green onion, if desired.
Close sandwich, wrap in foil. Hold warm until serving.