Preheat oven to 300°F (150°C).
Season ribs with smoked paprika, garlic powder, salt, and pepper.
Wrap tightly in foil and place on a baking sheet.
Bake 1 hour 30 minutes until very tender.
Meanwhile, whisk sugar-free ketchup, mustard, sweetener, and vinegar together for the glaze.
Unwrap ribs, brush generously with the glaze, and increase oven temperature to 425°F (220°C).
Roast uncovered 15–20 minutes, brushing with more glaze once, until caramelized at the edges.