ficus or hibiscus would be your best best.
a word about the cages, make sure they're soft mesh material with no sharp edges.
buddy of mine years back made a wood cage with the metal window screen material. the chameleons will sometimes scrape their mouths against things when they eat to help position food. this lead to them cutting and scraping their jaws on the sharp edges, which ultimately got infected, and killed them.
really if you have a tall pot, and don't have cats or other animals that would mess with them, you really don't need a cage or net around their tree. if they can't physically reach it, they have no way of getting to it.
you could also just use a fake tree if a real one is too expensive, or too hard to keep. i know in my house with how the windows are, i would be hard pressed to keep anything without supplemental lighting.
75G Reef tank - Planted tanks don't agree with me.