Crispy Coconutty Zucchini Fritters

Name: Crispy Coconutty Zucchini Fritters
Ingredients: 2 medium zucchini (10–12 oz. total); 1 red onion, thinly sliced; 2 medium jalapeños, thinly sliced; 1 tsp. Kashmiri chile powder or ¼ tsp. cayenne pepper; 3½ tsp. Diamond Crystal or 1¾ tsp. Morton kosher salt, divided, plus more; 1 cup plain whole-milk yogurt; 1 Tbsp. finely grated lemon zest, plus more for serving; 1 Tbsp. plus 1½ tsp. fresh lemon juice; ⅛ tsp. ground cumin; Vegetable oil (for frying; about 6½ cups); 1 cup coarsely chopped mixed tender herbs (such as cilantro, basil, and/or dill), plus more for serving; 1 cup chickpea flour; ⅓ cup unsweetened coconut flakes; 1 Tbsp. rice flour (optional); A deep-fry thermometer