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I never found eating a lot semi-cleanly that difficult. Imagine a ride with a 6h ~4500kJ ride for a total of around 7000kcal expenditure. I would usually eat a 1000kcal breakfast of bread with jam and quark. Then for the ride, 100g of carbs per hour for 600g/2400kcal sugar. Some big recovery meal/late lunch – today I ate a big tuna-rice bowl for 1000kcal, would have no problem extending that to 1600kcal. That's 5000kcal right there, and 2000kcal is easy enough to get from dinner and an evening snack (yesterday I made some veggie ragu and pasta for 1000kcal for example). Add some fruit juice with the meals for even easier energy.