The Ultimate Sticky Buns

Name: The Ultimate Sticky Buns
Ingredients: ⅔ cup whole milk; 5 tablespoons sugar, divided; 1¾ teaspoons active dry yeast (from one ¼-ounce envelope); 2 large eggs, room temperature; 2¾ cups unbleached all-purpose flour; 1 teaspoon kosher salt; ½ cup (1 stick) unsalted butter, cut into 1-inch pieces, room temperature, plus ½ tablespoon, melted; 1¾ cups chopped pecans (about 8 ounces); ½ cup (1 stick) unsalted butter; ¾ cup (packed) dark brown sugar; ¾ cup heavy cream; ⅓ cup honey; ¼ teaspoon kosher salt; ¼ teaspoon finely grated orange zest (optional); ½ cup (1 stick) unsalted butter, room temperature; ½ cup (packed) dark brown sugar; ¾ teaspoon ground cinnamon; ½ teaspoon freshly grated nutmeg; ⅛ teaspoon kosher salt; All-purpose flour (for dusting); 1 large egg; Coarse sea salt; An 8x8x2 metal baking pan