Preheat the grill to medium-high and set up for both indirect and direct heat.
Place the wings in a large bowl. In a small bowl, combine the salt, black pepper, garlic powder, and smoked paprika, then sprinkle over the wings and toss to coat evenly.
Arrange the seasoned wings on the indirect-heat side of the grill and cook for 10 minutes, flipping once about halfway through.
Move the wings to direct heat and grill for about 15 minutes, turning occasionally, until charred and an instant-read thermometer inserted into a large drumette reads 165°F and juices run clear.
While the wings cook, melt the butter in a medium saucepan over medium heat. Stir in the curry powder and flour and cook, stirring, for 1 minute.
Whisk in the coconut milk, fish sauce, chili garlic sauce, and a pinch of salt. Simmer the sauce for 5 to 10 minutes until slightly thickened.
Transfer the cooked wings to a heatproof bowl, pour the warm curry sauce over them, and toss to coat completely.
Serve immediately, garnished with the chopped cilantro.