Toss shrimp with 1 tbsp EVOO, salt, pepper, smoked paprika, and oregano. Let sit while the pan heats.
Heat a large pan over high until smoking. Add a drizzle of olive oil, then the shrimp. Cook until pink on one side. Add butter, swirl to coat, then remove shrimp to a plate.
In the same pan, add roasted garlic paste and cook for 30 seconds in EVOO. Sprinkle in chili flakes. Deglaze with clam juice (or water) and white wine, scraping up any browned bits. Reduce until syrupy.
Add ditalini, alubia blanca beans, and enough water to cover by about 2 inches. Season with salt. Bring to a boil, then reduce to a lively simmer. Stir every minute or so to help the pasta release starches and create a creamy broth. Cook until pasta is tender and liquid thickens, about 10 minutes.
Ladle the creamy beans and pasta into bowls. Top with buttery shrimp, toasted breadcrumbs, chopped Campari tomatoes, and diced Serrano chile. Finish with a generous drizzle of good table EVOO.