For the crust: Pulse the flour, pecans, shortening and butter in a food processor until it looks like coarse cornmeal. Then with the processor running, drizzle in the cold vodka 1 tablespoon at a time until it forms into a ball. Take it out and divide in half. Place on a piece of plastic wrap and pat each piece into a disk. Wrap and place in the fridge for at least 1 hour.
Preheat the oven to 350 degrees F.
Roll out 1 piece of pie crust on a lightly floured surface slightly larger than your pie tin. (Reserve the other half for another use.) Place into the tin, trim the edges and crimp the edges decoratively. Place a piece of parchment inside the pie shell, fill with pie weights or dried beans and bake for 30 minutes. Remove the pie weights and continue to bake until the pie crust is golden brown, another 10 minutes. Remove from the oven and allow the crust to cool completely.
For the filling: Combine the sweetened condensed milk, lime juice, sour cream, egg yolks and lime zest in the bowl of a stand mixer fitted with the paddle attachment and beat on medium-high speed for 2 minutes. Scrape the filling into your cooled pie crust.
Bake until the filling only wiggles a bit in the center when you gently shake the pan back and forth, 15 to 20 minutes. Don't allow the pie to brown.
Cool the pie on your counter for at least 15 minutes, then place in the freezer for an hour.
For the whipped cream: Put the cream cheese, powdered sugar, tequila and vanilla in the bowl of a stand mixer fitted with the whip attachment. Whip on high speed until creamy and smooth. Scrape down the mixing bowl. Add the cream and start on low speed to incorporate, and then turn to high speed and whip until stiff peaks form.
Scrape the whipped cream into a pastry bag fitted with a decorative tip and decorate your chilled pie. Garnish with a sprinkle of fresh lime zest over top.