Preheat oven to 375°.
To prepare cake, coat a 9-inch round cake pan with cooking spray. Line bottom of pan with wax paper; coat wax paper with cooking spray. Set pan aside.
Lightly spoon flour into a dry measuring cup; level with a knife. Place 1/4 teaspoon vanilla, salt, and eggs in a large bowl; beat with a mixer at high speed 2 minutes. Gradually add 1/2 cup sugar, beating until thick and pale (about 3 minutes). Sift flour over egg mixture, 1/4 cup at a time; fold in. Scrape batter into prepared pan. Bake at 375° for 20 minutes or until the cake springs back when touched lightly in center. Cool cake in pan on wire rack.
Combine the rum, condensed milk, and evaporated milk in a small saucepan over medium-high heat. Bring to a boil, stirring constantly. Remove from heat; cool to room temperature. Pierce top of entire cake with a skewer. Pour rum mixture evenly over top of cake in two batches, beginning at outer edge and working inward. Cool to room temperature. Cover and refrigerate overnight. Run a knife or spatula around outside edge of cake. Place a serving plate upside down on top of cake; invert onto plate.
To prepare fruit, combine the pineapple, kiwifruit, mango, and 1 tablespoon sugar. Cover and refrigerate overnight.
To prepare custard, place egg substitute in a bowl, and set aside. Combine 2 tablespoons sugar and cornstarch in a small saucepan. Gradually add 1/2 cup fat-free milk, stirring with a whisk until blended. Bring to a boil over medium heat; cook 1 minute, stirring constantly. Remove from heat; gradually stir one-fourth of hot-milk mixture into egg substitute. Add to the remaining hot-milk mixture, stirring constantly. Cook over medium heat 1 minute or until thick. Remove from heat. Spoon custard into a bowl, and place bowl in a large ice-filled bowl for 10 minutes or until custard comes to room temperature, stirring occasionally. Remove bowl from ice. Stir in 1/4 teaspoon vanilla; spread custard over cake. Serve with fruit mixture.