Preheat the oven to 375ºF (190ºC). Line 2 baking sheets with parchment paper.
In a food processor, combine the scallions, habanero peppers, garlic, ginger, brown sugar, soy sauce, allspice, cinnamon, and thyme. Puree until broken down into a into a thick paste, about 1 minute.
In a medium bowl, toss the chicken with 2-4 tablespoons of the jerk paste until well coated. Cover and refrigerate for 1 hour.
Meanwhile, make the jerk sauce: Combine 2-4 tablespoons of the jerk paste with the pineapple juice and ketchup. Season to taste with salt.
Thread the skewers with 2 pieces each of the marinated chicken, red onion, bell pepper, and pineapple, alternating ingredients.
Arrange the skewers on the prepared baking sheets. Season with salt. Brush about ⅓ cup (85 G) of the jerk sauce over the skewers. Reserve the remaining sauce.
Roast the skewers for 22-25 minutes, turning halfway, until the chicken is cooked to an internal temperature of 165ºF (75ºC).
Remove the baking sheets from the oven and discard the parchment paper, then return the skewers to the pans. Turn the broiler to high.
Baste the skewers on all sides with the jerk sauce.
Broil for 3-4 minutes, until the vegetables just begin to char and the sauce is slightly caramelized.
Transfer the skewers to a platter. Squeeze the lime wedges over the hot skewers and garnish with the cilantro.