Roll dough into a 12-inch circle; fit into a 9-inch pie plate coated with cooking spray.
Fold edges under, and flute.
Bake pie crust according to package directions.
Cool completely on a wire rack.
Combine sugar, 2 1/2 tsp. rind, and the next 4 ingredients (through eggs) in a large bowl, stirring well.
Combine milk and cheese in a medium, heavy saucepan over medium-high heat; cook until mixture reaches 180°F or until tiny bubbles form around edge (do not boil).
Gradually add the hot milk mixture to sugar mixture, stirring constantly with a whisk.
Return milk mixture to pan, and cook over medium heat 10 minutes or until thick and bubbly, stirring constantly.
Remove from heat; stir in butter.
Place pan in a large ice-filled bowl for 10 minutes or until the mixture cools to room temperature, stirring occasionally.
Spoon filling into prepared crust, and cover surface of filling with plastic wrap.
Chill for 3 hours or until set, and remove plastic wrap.
Spread the whipped topping evenly over chilled pie, and sprinkle with remaining 1/2 tsp. lemon rind.