In a large bowl, whisk together gochujang, maple syrup, soy sauce, sesame oil, rice vinegar (or lime juice), garlic, and ginger.
Add chicken and toss to coat. Cover and marinate in the fridge for at least 30 minutes (up to 6 hours for best flavor).
Add panko and coconut flakes to a food processor and pulse until finely combined. Stir in cornstarch.
Remove chicken from marinade using tongs and place on a paper towel-lined plate. Gently blot excess marinade so chicken is just slightly tacky.
Toss chicken in the panko-coconut mixture until evenly coated.
Thread chicken onto skewers.
Lightly spray both sides with avocado oil.
Arrange skewers in air fryer in a single layer. Air fry at 400°F for 5 minutes.
Flip skewers, spray again with avocado oil, and air fry for another 5 minutes, or until chicken is golden and reaches 165°F internally.
Whisk together bang bang sauce ingredients until smooth. Serve with skewers for dipping or drizzling.