I haven't done that specific diet, but I have been known to have cereal for a snack or meal other than breakfast. Many Europeans eat Meusli for dinner (with nuts & fruit for added protein & vitamins). I had a Dutch friend who's family liked to have cream of wheat for dinner once a week.
Their is no written rule or law that says you can't have cereal for any meal of the day. I would just make sure to have some milk or yogurt and some protein some time in the day too. Yes, have the fruit servings too. Your idea as you stated sounds OK to me with the regular dinner. I'd say go ahead and try it, if you want to.