Combine ground beef, green onions, garlic powder and cayenne pepper; form into four patties. Sprinkle both sides of each patty with steak seasoning. Cover and chill. (Patties can be made several hours in advance.)
Brush buns with melted butter; set aside. In small bowl, mix barbecue sauce with honey; set aside.
Grill burgers on medium-high heat to an internal temperature of 160 degrees, about 4–6 minutes per side. Two minutes before burgers are finished, grill buns, butter side down, until golden brown. Place cheese slices on burgers to melt.
Serve each burger on buttered bun topped with two slices bacon, two onion rings, honey barbecue sauce, lettuce and tomato.