For the marinade/glaze: In a small pot on medium heat, whisk together the honey, miso, orange juice, a shake or two of chili flakes and plenty of coarse ground pepper. Cook, whisking, until everything is combined and the liquid reduces and thickens a bit to a glaze consistency, 6 to 8 minutes. Let cool to room temperature.
For the chicken: Pour half of the marinade into a resealable plastic bag; reserve the other half for glazing. Add the chicken parts to the bag with the marinade and seal. Rest the chicken at room temperature for 1 to 2 hours.
When ready to grill, preheat a grill pan or half of a grill to medium heat.
Remove the chicken from the bag and pat dry with paper towels. Place on the indirect heat of the grill, skin-side down, and cook, covered, until the chicken easily releases from the grill, about 15 minutes. Then flip and grill on the other side until cooked through, 15 to 20 minutes more. In the last minute of grilling, brush each piece of chicken with a bit of the reserved glaze.