Toast the almond flour and finely chopped pecans in a dry skillet over medium heat, stirring constantly until lightly golden and fragrant, then remove from heat and let cool slightly

Transfer the toasted nut mixture to a mixing bowl and stir in the sugar free powdered sweetener until evenly combined

Pour in the melted butter and mix until the texture resembles damp sand and holds together when pressed

Press the crust mixture firmly into a prepared pie pan, working evenly across the bottom and slightly up the sides, then refrigerate until firm

Pour the boiling water into a heat safe bowl and add the sugar free lime flavored gelatin alternative, stirring until fully dissolved and clear

Stir in the ice water until completely melted and the mixture is cool

Gently fold in the whipped topping, then whisk lightly until smooth and uniform

Refrigerate the filling briefly until it thickens to a pourable consistency

Pour the thickened filling into the chilled crust and smooth the top

Sprinkle fresh lime zest over the surface and refrigerate until fully set before serving