I actually keep my mealworms in a large plastic container with oatmeal and a slice of potato or apple. They turn into beetles all the time, then a little later I get tiny new mealworms. Oatmeal is cheaper than mealworms, any day. I feed Pogona whichever I have most of: mealworms or beetles. She prefers beetles. This has been her main source of insects for over a year now, with occasional crickets, and she is quite healthy. I do spot an occasional undigested mealworm in her poop, so I'm thinking of switching to something else or combining with something else.
I have never fed her the pupae. I prefer to get the beetles so they have a chance of reproducing, and she probably wouldn't be too interested. She seems to like the movement of the MW and beetles.