I will try to get the pics of the feeders tomorrow but I'm not sure why he wont eat them dusted. It's probably due to the same colors. When I feed worms I just let them crawl up the cage and the chameleon usually eats it immediately.
On the whole not liking crickets, it is more than likely because he has become picky and prefers the worms (it happens a lot), unfortunately the mealworms and superworms are not prefered for a main diet because they are high in fat. If you'd prefer him eat crickets just dont feed him for a few days and he will eventually take the crickets. He'll be fine not eating until he eats the crickets. Another feeder that I like to use are silk worms. I also give them hornworms as a treat. My veiled also loves fruits and vegetables :p