That seems like a lot of effort for something you can easily just buy.

I sometimes buy corn cakes, 110g for 0.95 (which here is super cheap) and I get 84g of carbs in 100g so 92g of carbs for less than a franc. And the pacakge fits into my jersey even. And it comes with a little salt as well, which is perfect. I use that at the beginning on long rides, if the climb isn't right at the beginning.