I personally wouldn't feed my dragon dead crickets. What you could do is separate the adult crickets and gut load them. When their done eating put them in the freezer to preserve them. You wouldn't know for sure how long the crickets have been dead so preserving them is a better way.
You should consider breeding dubias(or roaches in general) as they have Less chitin, more meat, easy to breed, escapees can't repopulate, no smell, more interesting than crickets, lives for 1-1.5 years..... I could go on forever.