My dad is diabetic and always carries a cooler on flights with him, loaded to the gills with snacks. He's not insulin dependant and doesn't have meds with him, but most of his flights are from the east coast to Seattle, he has snacks- it's a long running joke in the family. Anyway, he will bring bagels with cream cheese already on them, among other things, and he's never had a problem. He also has cheese & crackers, peanut butter crackers, fruit & pepperoni. The only thing he ever has problems with is that he puts ice cubes in a baggie to keep everything cold, since ice cubes aren't a liquid yet. Some security folks let him keep them, others make them dump it, and sometimes they go over it with the scanner thing.
I would think you could pack the cream cheese with cooler bags in your checked bags if you weren't going to eat them on the plane.