You can substitute 1 teaspoon paprika plus 1/2 teaspoon red chile flakes for the Aleppo flakes, and 1 teaspoon fine salt for kosher salt. You can use ground beef instead of lamb, or a combination of both, which is very nice.
You can use metal skewers instead of bamboo, if you like.
You can skip chilling the kabobs in the refrigerator once shaped. While any kind of grill will work, a narrow, hibachi-style grill is perfect for skewered meat.