also lettuce has little to no nutritional value, a mix of dry goods is more appropriate for your worms although i have not got my recipe down to a tee yet so i cant really give you one but other people have good dry mixes they can recomend to u... this is camimoms gutloading info, all good stuff... The "wet" portion of the gutload, which should be your principle gutload, can frequently includes things like (switch it up with a different couple of items every other week): dandelion leaves, squash (butternut, spaghetti), hibiscus leaves and flowers, yam, orange, papaya, carrot, alfalfa sprouts, mustard greens, romaine, leek bulb, spearmint leaves, apple, peas, blueberries, grape leaves, raspberries, arugula (rocket), sunflower sprouts, mulberries ... Fruits and veggies such as these are important both for the nutrients they give (via the insect) to your chameleon, and also because well hydrated prey results in a better hydrated chameleon.
The dry portion (the lesser portion) of a gutload can include (blend/grind fine with a coffee grinder or food processor): spirulina; dried seaweed/kelp/dulse; bee pollen; dried alfalfa; organic raw sunflower seeds; sesame seeds; flax seed; hemp seed; poppy seeds; dehydrated cranberry powder; beet powder; zucchini powder; kale powder; dried Mulberries; fig powder; ground dried hibiscus; ground almonds; small amounts of ground brazil nuts; small amounts of ground/chopped beechnuts; oak leaves; small amounts of quality whole grain cereal / barley /oats / cracked rye /wheat germ / stabalized rice bran/ quinoa; small amounts of quality monkey, avian or ignuana food (read the ingredients, be cautious of too much Vitamin A or animal fat).
Limit your use of grains, beans, and other items higher in phosphorous than calcium (a little can be very good, a lot is not unless you compensate to fix the ratio). Good grain choices are stabalized rice bran and crushed whole barley.
Limit use of broccoli, beet leaves, parsley, cassava, watercress, kale, collard greens, spinach and Soy (anything high in phytates/Phytic acid, Oxilates/ Oxalic Acid, Goitrogens). Some is fine, possibly beneficial. Just not as a regular item.
Avoid dog food, cat food, fish food, and other preared foods that are significant sources of animal protien and/or fat and may provide excessive preformed vitamin A and also D (a little now and then is okay, but too much can lead to gout and other issues). Similarily avoid/limit milk, meat, eggs, etc.
but if he does take a new liking to them then I will certainly consider it being that it is so easy. 
