Bring a large pot of lightly salted water to a boil. Cook orzo in the boiling water, stirring occasionally until cooked through but firm to the bite, about 11 minutes. Drain and transfer to a bowl; mix 2 teaspoons pesto and 2 tablespoons extra-virgin olive oil into orzo.
Heat remaining 1 tablespoon extra-virgin olive oil in a skillet; cook and stir shrimp, red bell pepper, and capers in hot oil until shrimp is heated through, 3 to 5 minutes. Stir remaining 1 teaspoon pesto, oregano, garlic powder, red pepper flakes, salt, and pepper into shrimp mixture; cook and stir until combined, 1 to 2 minutes.
Mix orzo into shrimp mixture; sprinkle with Parmesan cheese and drizzle with olive oil.
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