Eggnog Flan on Cinnamon Crust

Name: Eggnog Flan on Cinnamon Crust
Ingredients: 1 cup all purpose flour; 1/2 teaspoon (generous) ground cinnamon; 1/8 teaspoon (generous) freshly grated or ground nutmeg; 1/8 teaspoon (generous) salt; 1 large egg yolk; 1 tablespoon whipping cream; 6 tablespoons (3/4 stick) unsalted butter, room temperature; 3 tablespoons sugar; 1 3/4 cups sugar, divided; 1/3 cup water; 1 tablespoon light corn syrup; 6 large egg yolks; 2 large eggs; 2 cups heavy whipping cream, divided; 2 cups whole milk; 2 tablespoons dark rum; 1 tablespoon freshly grated or ground nutmeg; 1 cup chilled heavy whipping cream; 1/4 cup powdered sugar; 1 tablespoon dark rum; 3/4 teaspoon vanilla extract; Freshly grated or ground nutmeg (for sprinkling)