Preheat oven to 350F. Grease a Bundt pan and set aside. In a mixing bowl, combine flour, baking powder, baking soda, and sugar. Add wet ingredients (plant-based milk and applesauce), then stir until just combined. Stir in blueberries. Pour batter into prepared pan and bake 25 to 40 minutes, until a toothpick inserted in the middle comes out clean. (It takes about 35 minutes, but different pans vary cook time.) Meanwhile, make icing. In a small bowl, whisk powdered sugar with orange juice, zest, and plant-based milk as necessary until a runny glaze forms. Spoon glaze over warm cake and let run down the sides.