Wow! Your poor kids!
We have lots of cereals in our cupboards, none of them terrible sugary as I won't buy 'kids' cereals. Invariably they opt for the same ones on a school morning:
DD1 (7) goes for Weetabix, Cheerios or Shreddies (with no added sugar) or sometimes plain porridge/ready brek mix with a tiny sprinkling of brown sugar. I add the ready brek to the kids' porridge because it's fortified.
DD2 (5) always has porridge, a massive bowl of it. She's minute too - you'd never believe the amount she packs away at breakfast. Sometimes she'll go for a bit of variety and have some granola with chopped banana instead
DS (3) always has shredded wheats - the plain ones, with nothing on them except milk
If I've dragged my weary ass out of bed early enough then they might have poached or boiled eggs on toast.
All kids have a large glass of 50:50 apple juice/water
At the weekends they will sometimes have eggs on toast or toast with Marmite/peanut butter/honey on. Or Staffordshire oatcakes with melted cheese on. Sundays are usually pancake days. DH does them crepe style, I do them American/Scotch style. Either way they are served with bananas and maple syrup or lemon and sugar. Extra fruit is also provided.
I can't imagine your children are really being set up for the morning with so little inside them. Fruit on its own is just going to give them a short term sugar rush and then a crash sometime mid-morning. They need carbs or protein. Fruit also isn't that great to serve as a meal or snack on its own as it's really bad for kids' teeth.