Bake the empty 9-inch pastry shell using the package’s blind-baking directions, then set it aside to cool fully. The shell should look baked through and feel cool across the bottom before any cream filling touches it.
Whip the cold heavy cream with the powdered sugar in a small bowl using an electric mixer. Stop at stiff peaks, when a lifted beater leaves a defined point that stands upright rather than folding over.
Work the softened cream cheese, brown sugar, salt, and maple syrup together with the mixer in a separate large bowl, scraping the sides as needed. A properly blended mixture resembles glossy frosting, with no visible cream cheese lumps.
Use a rubber spatula to incorporate the whipped cream into the cream cheese mixture, then distribute 1 cup of the chopped pecans with gentle strokes. Cut down through the center and sweep around the bowl, turning it as you fold, until the filling looks evenly combined but still airy.
Fill the cold pastry shell, level the surface, scatter the remaining pecans over it, and refrigerate for at least 2 hours or up to overnight. The filling should feel firm enough to hold a cut edge rather than slump into the space left by a slice.
Cut the chilled pie with a sharp knife, wiping the blade between cuts. Each portion should show a fluffy interior dotted with pecans above the pastry shell.