Preheat your oven to 400°F and line a large baking sheet with parchment paper.
Slice the bell peppers into wide, chip-like triangles, removing all seeds and membranes.
In a medium bowl, toss the shredded pork shoulder with the smoked paprika, cumin, sea salt, and black pepper until evenly coated.
Arrange the bell pepper triangles in a single layer on the baking sheet and top each scoop with a portion of the seasoned pork and black beans.
Place the baking sheet in the oven and roast for 8 to 10 minutes, or until the peppers are tender-crisp and the pork is sizzling.
While the nachos roast, mash the avocado in a small bowl with the lime juice and finely minced red onion.
Remove the nachos from the oven and transfer to a serving plate.
Garnish with dollops of the avocado mash, fresh cilantro, and thinly sliced jalapeños before serving immediately.