Low protein? Not sure where you picked up that information, but I have to disagree.
"The live mealworm is made out of
20% protein, 13% fat, 2% fiber, and 62% moisture, while the dried mealworm is made out of 53% protein, 28% fat, 6% fiber, and 5% moisture. Mealworms are anything but difficult to breed and have a profitable protein profile. Consequently, they are delivered as feed for pets and zoo animals, including winged animals, reptiles, and fish."
The mealworm (Tenebrio molitor L.) is perhaps the greatest creepy beetles feeding on stored items. Grown-up hatchling weighs about 0.2 g and is 25–35 mm long. The grown-up larvae are utilized as human sustenance in certain countries of the world. The pupa...
link.springer.com
I don't know what you would consider high protein if 20% is too low. Nutritional requirements for parrots vary by species, but from what I've read, most need around 10-20% protein and 5-10% fat in their diet overall, so mealworms are a bit fatty, but definitely not a poor source of protein, especially compared to most plant sources.
If anyone's interested,this article has a nice breakdown of the nutrient content of four common feeder insects, crickets, mealworms, waxworms and superworms.
onlinelibrary.wiley.com
...
All that being said, if you want to add animal protein into your parrot's diet, I would try eggs, not insects. Very easy to prepare, good protein source, and generally well-accepted, even by picky eaters. Live feeder insects are a lot of work for relatively little reward, unless you are feeding an animal that needs live prey, like some reptiles, fish, and a few songbirds.
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But little to say about that and more to say about yes, it is okay to feed your bird meal worms as long as they are bought from a farm or a local petsmart (or dead)
