Preheat oven to 350°F (175°C) and line an 8x8 inch square baking pan with parchment paper.
Mix graham cracker crumbs and melted vegan butter in a bowl until combined, then press firmly into the bottom of the baking pan.
Bake the crust for 10 minutes, then remove from oven and set aside.
Place soaked cashews, coconut milk, 1/3 cup maple syrup, lemon juice, vanilla extract, and cornstarch into a high-speed blender.
Process until the filling is completely smooth and free of grit.
Pour the cashew cheesecake mixture over the pre-baked crust and spread evenly.
In a small saucepan over medium heat, combine 1/2 cup maple syrup, vegan brown sugar, and sea salt.
Bring the mixture to a simmer for 2-3 minutes until slightly thickened, then stir in the chopped pecans.
Carefully spoon the pecan mixture over the cheesecake layer, ensuring even coverage.
Bake for 35-40 minutes until the edges are golden and the center is mostly set.
Allow bars to cool to room temperature, then refrigerate for at least 4 hours to firm up before slicing into 12 bars.