I found this interesting link for maintaining a wax worm colony (which is pretty different than keeping supers):
for keeping supers you can use a medium of rolled oats, wheat bran, chicken mash, corn meal, or "worm chow" (Available thru most bug distributers). Pretty much any grain or cereal can be used as a storage medium/food source (as long as it isn't a "sweetened flavored cereal" natural cereal only like corn flakes, puffed rice, etc.).
Carrots work best for a moisture source for supers, apples tend to put too much humidity into their enclosure so I would only suggest apples with in the 24 hours before you plan on feeding the super so he is properly gut loaded for your herp. Using cornmeal would be more of a storage medium than a gutload food. You should use apples, potato, carrot, and maybe some leafy greens to gutload your feeders. Here is a good article on gutloading: http://carolinapetsupply.com/gut_loading_insects.html
Here is another helpful link for raising supers:
You can't refrigerate the super worms it will kill them. They need temps around 65-75*f. They're not like mealies that you can refrigerate into stasis and keep for several months fine like that. So hopefully when you referred to refrigerating the bugs you were talking about the waxies since they use the honey mixture. Supers should have a non-sticky medium from what I understand of their care. Just the cereal/brans/mash feeds and gutloading foods. I would use caution with an old box or bag of corn meal esp. if it has been opened. It could have mold spores or other contaminants from sitting unused for so long. You might just want to get new or go to tractor supply and get a bag of chicken mash. It's really inexpensive & lasts forever.
You're very welcome for the info. Glad I could help.
Cornmeal isn't the best for a gutload, but you can use it as a base, just as long as you add some better items with it (spirulina, kelp like you mentioned). I think most people are critcal about any gutload that is corn based. But if you read the ingredients to alot of the commercially sold cricket gutloads (I wont list any brandnames) in the big chain pet stores, you'll see alot of them are corn based. I don't think it's the best stuff to use, but it is definitley usable. Just be sure and augment some more nutritious sfuff with it.
Corn is fine as a holding medium. however Its a poor gutload choice.
Just to clear up one myth about corn being so horrid in petfoods.... it is only horrid when the BY PRODUCT is used. Whole kernal corn used in petfoods is actually an alternative protein source and less likely to cause allergic reactions than wheat or soy which are #1 (soy) and #2 (any type of wheat product) cause more reactions in dogs than whole kernel corn.
for the op... not looking to cut off sandra but all the standard gutload items should apply across the board when gut loading feeder insects from my understanding of gut loading. Hopefully sandra will be able to tell you if there is any veggie/fruit that will be harmful to your cham or the waxie.
i remember reading that you seldomly to never use wax worms for chameleons