Your are correct. Mealworms are NOT recommended for beardies. Their hard shells are an impaction risk, and they offer little of the nutrition that beardies require.
Might I recommend Phoenix Worms? They are filled will calcium (no need to dust, except for vites). They are small, soft, and if need, can be used as a staple if your beardie prefers them (a good protein to fat ratio). Our beardie LOVES hers. She still eats crickets, but anymore, the PWs have become the staple of choice. They are easy to keep (no feeding, and last a long time). They are small. Our beardie is 6-7 inches and eats the mediums, easily. We order at MulberryFarms.
Hope this helps!
The best,
Em