To make the crumb topping, place cereal in a sealable plastic bag. Seal bag, and finely crush cereal with a meat mallet or other heavy utensil. Transfer crumbs to a medium bowl. Add oats, brown sugar, 2 tbsp sugar, and 1/2 tsp cinnamon to the bowl and mix well. Add butter, and mash and stir until uniform.
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To make the cake, in a large bowl, combine whole-wheat flour, 1/2 cup sugar, all-purpose flour, baking powder, 3/4 tsp cinnamon, baking soda, pumpkin pie spice, and salt. Whisk thoroughly. In a medium-large bowl, combine pumpkin, egg substitute, club soda, buttermilk, and vanilla extract. Whisk until uniform. Add mixture to the large bowl, and whisk until uniform.
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