Cut the pork loin and pork belly into uniform 1-inch cubes to ensure even cooking.
In a medium mixing bowl, whisk together the gochujang, coconut aminos, toasted sesame oil, raw honey, grated ginger, minced garlic, sea salt, and black pepper.
Add the pork cubes to the marinade and toss until every piece is thoroughly coated; let marinate in the refrigerator for at least 30 minutes.
While the pork marinates, chop the red bell pepper into 1-inch squares and cut the green onions into 1-inch lengths.
Thread the marinated pork onto skewers, alternating between the lean pork loin, the savory pork belly, bell peppers, and green onions.
Preheat a grill or a cast-iron grill pan over medium-high heat and lightly brush with a high-smoke point oil.
Place the skewers on the grill and cook for 3-4 minutes per side, turning occasionally, until the pork is cooked through and the edges are beautifully charred and caramelized.
Remove from the heat and let the skewers rest for 2 minutes before serving to allow the juices to redistribute.