I have to buy cuttlefish bone for my finches. Sometimes I will throw a chunk in with the meece but they don't seem to touch it. I give nursing and pregnant does scrambled eggs, however, and I have been known to put ground cuttlefish bone in there.
Yeah, mine only get it when they're busy making nutrients for their babies (males never or almost never get it). I've also mixed millet in with the eggs. You can use your imagination, really. The mice don't care if it doesn't look the prettiest.
If you think the budgie seed is like popcorn, give them some of the millet still on the spray (sold for birds)! Mine devour it as though there's no tomorrow!
Willow, if you wanted to add mealworms to scrambled eggs, I don't see why you couldn't!
One other thing: when I make scrambled eggs for my mommas, I prepare it with human infant formula, not regular milk. I do this to make sure it's as chock full of protein, fat, and nutrients as possible so the growing babies get good nutrition.