Preheat the oven to 350 degrees F (175 degrees C). Grease a 9-inch pie pan.

Pulse graham cracker crumbs, oats, water, soy flour, and cream cheese together in a food processor or blender on high until smooth. Press crust mixture into greased pie pan.

Mix cream cheese, cottage cheese, milk, and liquid egg substitute in a blender until completely smooth. Pour into a large mixing bowl. Add sweetener, yogurt, soy flour, and vanilla extract and mix well. Pour filling into crust.

Bake in the preheated oven until top begins to brown, about 1 hour. Let cool completely, 3 to 4 hours. Refrigerate until serving.