Position racks in upper third and middle of oven; preheat to 425°F.
Combine 1 tablespoon oil, paprika and 1/4 teaspoon salt in a medium bowl. Very thoroughly pat chickpeas dry, then toss with the paprika mixture. Spread on a rimmed baking sheet. Bake the chickpeas on the upper rack, stirring twice, for 30 minutes.
Meanwhile, puree buttermilk, yogurt, herbs, 1/4 teaspoon pepper and garlic powder in a blender until smooth. Set aside.
Heat the remaining 1 tablespoon oil in a large skillet over medium heat. Add kale and cook, stirring occasionally, for 2 minutes. Add water and continue cooking until the kale is tender, about 5 minutes more. Remove from heat and stir in a pinch of salt.
Remove the chickpeas from the oven and push them to one side of the pan. Place salmon on the other side and season with the remaining 1/4 teaspoon each salt and pepper and juice of lime. Bake until the salmon is just cooked through, 8-10 minutes. Time will depend on the thickness of salmon.
Drizzle the reserved dressing on the salmon, garnish with more herbs, if desired, and serve with the kale and chickpeas.