Combine the habanero peppers, thyme, red onion, grated ginger, garlic, soy sauce, lime juice, brown sugar, allspice, cinnamon, nutmeg, salt and black pepper in a food processor and puree until smooth.
Place the chicken thighs in a large zip-top bag and pour in the jerk marinade, coating the chicken evenly; seal the bag and marinate at least 1 hour or up to 16 hours in the refrigerator.
When ready to cook, preheat the grill to medium heat. Remove chicken from the marinade and place on the grill; cook about 5 minutes per side until cooked through.
While the chicken cooks or rests, grill the red pepper rings 1–2 minutes per side until slightly softened and charred.
Remove the chicken from the grill and let rest 5 minutes, then slice into strips.
Arrange chopped romaine on a large platter. Top with grilled red pepper rings, sliced cucumber, pineapple chunks and avocado slices.
Fan the sliced chicken over the salad and drizzle with the honey mustard dressing. Serve immediately.