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Preheat oven to 400°F. Stir together garlic, 2 teaspoons kosher salt, spice blend, and black pepper. Rub mixture all over pork chops; let stand 10 minutes.
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Melt 2 tablespoons butter over medium-high in a large ovenproof skillet. Add pork chops, and sear, undisturbed, until dark golden brown on bottoms, 4 to 5 minutes. Flip pork chops, and sear, undisturbed, until dark golden brown on other side, 4 to 5 minutes. Transfer pork chops to a plate.
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Reduce heat under skillet to medium, and add remaining 1 tablespoon butter. Stir in shallot, and cook until lightly golden, 2 to 3 minutes. Add peas, radishes, remaining 1/4 teaspoon salt, and additional pepper to taste, stirring to coat with skillet juices. Stir in 1/4 cup water, scraping up any browned bits from bottom of skillet using a wooden spoon.
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Nestle pork chops in pea mixture in skillet; and transfer to preheated oven. Roast until a thermometer inserted in thickest portion of pork chops registers 135°F, 10 to 15 minutes. Remove from oven, and let rest 10 minutes. (Temperature will continue to rise to 140°F.)
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Serve pork chops with couscous, if using. Sprinkle evenly with herbs and lemon zest, and garnish with flaky sea salt.