Sorry to say that just because they haven't gotten impacted on your "unique" way of offering them doesn't mean it won't or can't happen... Some (uneducated) people feed their animals meal worms for their entire lives with no bad consequences. Does that mean it will be okay for other animals? Absolutely not.

Meal worms suck as a feeder. Even if you poke them full of holes (and who would want to do that?) they are still lacking in nutrients and covered in a mutilated shell that could still cause impaction.