Heat a gas grill to medium-high.
To make the bacon, set a fireproof skillet on the grill rack. Add the bacon and cook until chewy, then transfer to a paper towel lined plate. Strain and discard solids from the bacon drippings and pour into a large mixing bowl; reserve for later use in pork patty mixture. Clean skillet and add brown sugar, apple butter, wine, and cayenne pepper, stir well. Add bacon back to skillet and place over heat for 4-5 minutes to caramelize the mixture onto the bacon slices and cook bacon to chewy crisp state.
To make the apples, wipe the skillet with paper towels. Add the apples, sugar, wine, lemon juice and zest, vinegar, and cinnamon. Stir and cook until thickened, about 5 minutes. Pour into a bowl and set aside.
To make the haystacks, place a large, high-sided, cast-iron pan on the grill rack or side burner. Pour in the oil and heat to 350 degrees F. Place the onions in the buttermilk and set aside for 10 minutes. Meanwhile, pulse the potato chips in a food processor until very fine, then transfer to a large mixing bowl and stir in the flour and black pepper until well incorporated. Working in two batches and using tongs, gently lift the onions out of the buttermilk, shaking gently over the bowl to release excess liquid, then drop into the potato chip mixture and toss gently until well coated. Gently lower into the hot oil and fry until golden brown, about 2 minutes. Transfer to a paper-towel-lined plate to drain. While warm, sprinkle with 1/4 teaspoon of the salt and break into three equal pieces. Repeat with the remaining onions. Set aside until assembling the burgers. Remove the skillet from the grill.
To make the glaze, combine all of the ingredients in a small bowl and whisk well.
To make the patties, add the pork to the bowl containing the reserved bacon drippings. Add the apple, wine, and chips and toss with a fork gently to combine. Form 6 equal patties, depressing the centers with your thumb so they don’t puff during grilling. Sprinkle both sides of the patties with the seasoned salt.
Brush the grill rack with vegetable oil. Place the patties on the rack, cover, and cook for 5 minutes, then brush liberally with glaze. Turn the patties over carefully and brush with more of the glaze. Place 1 ounce of the cheese on each patty. Cover and cook for 4-5 minutes longer for medium doneness or until the burgers register 145 on an instant read thermometer. Transfer cheese topped patties to a plate to rest until assembling the burgers.
Place the buns, cut sides down, on the grill rack to toast lightly. Spread the cut sides of the rolls with the apple butter.
To assemble the burgers, place a cheese-topped patty on each bun bottom. Top each with 2 slices of the bacon, followed by 2 tablespoons of the apples, a mound of the onions, and the bun top. Serve immediately.