Preheat the oven to 400°F. Line a large rimmed baking sheet with aluminum foil and set aside.
Pat the 4 pounds of chicken wings very dry with paper towels. Place the wings in a large bowl.
In a small bowl, whisk together 4 tablespoons melted unsalted butter, 2½ tablespoons sesame oil, 3 teaspoons garlic powder, 1 teaspoon kosher salt, and ½ teaspoon freshly ground black pepper. Pour this mixture over the wings and use your hands to toss and coat each wing evenly.
Arrange the wings in a single layer on the prepared baking sheet. Bake for 50 minutes, flipping once with tongs halfway through (about 25 minutes), until the skins are browned and crisp.
About 15 minutes before the wings are done, make the sauce: In a medium saucepan over medium heat, melt the remaining 4 tablespoons unsalted butter. Add ½ teaspoon crushed red pepper flakes, 1 teaspoon grated fresh ginger, and 3 cloves minced garlic. Cook, stirring, for about 1 minute until fragrant.
Add ½ cup honey, ¼ cup Sriracha sauce, 2 tablespoons Worcestershire sauce, 1 tablespoon balsamic vinegar, and 1 tablespoon lime juice. Bring to a gentle boil, then reduce to a simmer and stir constantly for 3 minutes.
To thicken the sauce without lumps, remove about 1 tablespoon of the hot sauce into a small bowl and whisk in 1 teaspoon cornstarch until smooth. Return the slurry to the saucepan, simmer for about 30 seconds until the sauce slightly thickens, then remove from the heat and set aside.
When the wings are finished baking, carefully remove the baking sheet from the oven and increase the oven setting to broil.
Transfer the wings to a large, heatproof bowl. Pour the warm sauce over the wings and gently toss to coat evenly.
Drain any excess oil from the baking sheet (tilt and pour off or blot with paper towels), then return the sauced wings to the baking sheet in a single layer.
Broil the wings 4–5 minutes, watching closely, until the sauce is sticky and beginning to caramelize. Remove from the oven.
Transfer the wings to a serving platter and sprinkle with 2 teaspoons sesame seeds and ¼ cup chopped fresh scallions. Serve immediately.