I'd leave my outdoor lights on at night and see what the lights attract, but you might have more competition in the city, because there's so much light pollution.
If my supplementation, you mean vitamins and calcium, I like to use a handful of products and rely on 3 main ones as staples. I like sticky tongue farms calcium, and repashy LoD. My main 3 are plain calcium, Dendrocare, and Repashy Vitaplus. I use calcium twice a week, Dendrocare once or twice a week ( twice a week if they are eating less often ), and Repashy Vitaplus every other week. I've never noticed any edema with this regime, no MBD, bloodwork has been good, and I never use supplements of more than 3 or 4 days a week. I rely on my gutloading practices to supply most of what they need.
I apply the same practice to my veiled, except I use Repashy vitaplus once a week with him and have since I received him as a tiny 3-4 month old.
I suggest dusting about 1/3 of the feeders offered per day. I coat the feeders so I can just see the dust, but don't make them look like ghost or battered for the fryer.
Water, water, water! Not 18 30sec sessions a day, but at least 1 15mins session per day and 3 30mins or longer sessions per week. I aim my mistings to coincide with when the chameleons are most likely to take advantage of them. A couple hours after the lights are on, they get a misting and I vary the times of the other sessions to give them heavy mistings at mid day and up until a couple hours before all lights go out. My lights are staggered to simulate morning, midday-evening, dusk, and night time.
I think people over emphasize the need for cool temperatures. 74F-78F with 83-85F basking spots ( they rarely use, but they should still have them ) should be appropriate for any morph.
I also keep mine in densely planted enclosures, that are brightly lit. Most people swear they hate bright light. They don't want to be baked off of their perch, but they definitely live in brightly lit areas, with foliage cover from direct sun.
CB are much more adaptable than WC, which seems like and obvious statement, but I found myself on a steep learning curve with the moods of WC animals and am still learning. These are smart animals and they really resent the change from the wild to captivity.