Prepare the couscous as the label directs. Cover and keep warm until ready to serve. Meanwhile, heat 1 tablespoon olive oil in a large ovenproof skillet over medium-high heat. Add the shrimp and red pepper flakes and cook, stirring occasionally, until the shrimp are pink, about 3 minutes. Transfer to a plate using a slotted spoon. Preheat the broiler. Heat the remaining 1 tablespoon olive oil in the skillet. Add the tomatoes, fennel and garlic and cook, stirring occasionally, until the vegetables are tender, about 4 minutes. Add the wine and bring to a simmer, then add the chickpeas and 1/3 cup water; cook, stirring occasionally, until the chickpeas are slightly softened, about 3 minutes. Return the shrimp to the skillet and add the scallions and 1 tablespoon dill. Top with the feta, transfer to the broiler and broil until golden, about 2 minutes. Sprinkle with the remaining 1 tablespoon dill. Fluff the couscous with a fork and serve with the shrimp mixture.