Add the sirloin to a large bowl and mix with ¼ cup olive oil, cumin, paprika, 2 cloves of minced garlic, lemon juice, honey, 1 teaspoon salt, 1 teaspoon pepper, and parsley. Mix, using your hands, until the steak is completely coated. Let marinate for 30 minutes, or transfer to a sealable bag and marinate for up to 5 days in the refrigerator.
To make the haydari, combine the yogurt, ¼ cup olive oil, feta, dill, mint, 5 cloves garlic, and a pinch of salt in a food processor. Pulse until smooth. Herbs and garlic should be chopped, not blended. Season to taste with salt as needed.
To make the kabobs, heat the grill to 400 F or medium-high heat. Assemble the kabobs on metal skewers, spearing first a zucchini, then an onion slice, then a piece of steak, a tomato, and another zucchini. Continue as needed until skewer is full, then finish skewer with a piece of sirloin.
Spray the kabobs with cooking oil and place on the grill over direct heat. Grill until deeply browned and charred, flipping once, about 7-10 minutes per side. Once the meat is cooked through and vegetables are soft, remove from the heat.