Combine scallions, scotch bonnet peppers, onion, garlic, ginger, thyme, allspice, brown sugar, cinnamon, nutmeg, cloves, soy sauce, lime juice, oil, salt, and pepper in a food processor. Blend until mostly smooth.
Score the chicken pieces with shallow cuts through the skin. Toss thoroughly with the marinade, coating every piece completely.
Cover and refrigerate for 12 hours (minimum 4 hours, maximum 24 hours).
Light a charcoal grill and let coals burn to medium heat with a two-zone fire (hot side and cool side). Add pimento wood chips to the coals if using.
Sear chicken skin-side down over the hot side for 4–5 minutes per side, until deep mahogany-brown with char marks.
Move chicken to the cool side, close the lid, and cook for 25–30 minutes, flipping once, until internal temperature reaches 165°F at the thickest part.
Rest for 5–10 minutes before serving with lime wedges and extra scotch bonnet on the side.