Make the brine: Place ice in a large container.
Place remaining ingredients and 4 cups hot water in a pot and bring to a boil. Remove from heat and pour over ice to cool.
Place chicken in brine for 2 hours.
Make the agrodolce: In a pan, cook garlic in oil over medium heat for 1 minute. Add chile and cook for 1 minute. Add honey, cover with lid, and cook for 7 minutes or until an instant-read thermometer registers 240°.
Remove lid and slowly add hot sauce and vinegar. Cook for 12 minutes. Whisk in xanthan gum and cook for 5 minutes. Set aside.
Preheat oven to 375° and prepare a grill for medium heat (350° to 450°).
Grill wings until cooked through.
Toss wings in agrodolce, then arrange on a baking sheet and bake for 5 minutes.
Arrange wings on a platter and top with green onion, Fresno chile, red onion, lemon juice, olive oil, and salt to taste.