I’ve made this a couple times and it is labor and ingredient intensive. My crust shortcut now relies on Hannah Max Cookie Chips (Safeway carries this) or Pepperidge Farm Bordeaux cookies mixed with some yummy crispy oatmeal granola (bulk section Whole foods), as I normally have those on hand. Then I melt the butter, adjust sugar to taste (usually reduce by half) and just prepare it like a traditional graham cracker crust. It’ll save you half a day’s work. Also, you can find Corn flour in the bulk section at WF. Masa can work in a pinch too..