In a medium mixing bowl, combine pork riblets, 1 tablespoon vegetable or canola oil, rice wine, soy sauce, sugar, five spice powder, and white pepper. Let marinate for at least 30 minutes or up to overnight, covered in the fridge.
Preheat the air fryer for a couple of minutes at 375℉. Meanwhile, in a large resealable bag, add ½ cup potato starch and ½ the riblets. Give the bag a good shake, ensuring that each piece is evenly coated. Repeat for all the riblets, adding more potato starch if needed.
Place the riblets in the air fryer basket without overcrowding and spray evenly with vegetable or canola oil.
Cook the riblets at 375℉ for 8 minutes, give them a toss and cook for another 8 minutes. You may need to give the riblets another spray of vegetable or canola oil at the halfway mark. Remove and set aside. Depending on the size of your air fryer, you may need to cook in multiple batches.
Meanwhile, with a mortar and pestle, coarsely grind white peppercorns. In a small bowl, combine white pepper, five spice powder and coarse kosher salt. Set aside.
In a wok or large frying pan, on medium heat, add 2 tablespoons vegetable or canola oil, chili and white parts of green onion. Stir fry for 30-60 seconds. Add garlic. Stir fry for another 30 seconds, until fragrant. Add the riblets, tossing them quickly. Turn off the heat. Add the green onion and cilantro and give them another toss. Season with ½ teaspoon seasoning salt or as much as desired.