In a large bowl, combine ice cream, half of the lemon curd and all of the limoncello and lemon zest. Spoon into crust. Freeze, covered, several hours or overnight., In a microwave, heat chocolate with 1/4 cup cream at 70% power until melted; stir until smooth. Set aside to cool., In a small bowl, beat remaining cream until soft peaks form. Beat in marshmallow creme. Fold in remaining curd. With a spatula, fold half of the cream mixture into cooled chocolate mixture just until blended. Fold in remaining cream mixture; spread or pipe over top of pie. Freeze, covered, 1 hour., Remove from freezer 10 minutes before serving. If desired, top with lemon peel.