I have thought about that, and here's what I suggest: have 7 potted plants, and put a different one in the enclosure every day, rotating them; each gets one day of darkness and six days of natural light. How's that for a system to keep them alive?
It is artificial of course (it was originally part of the indoor enclosure for a gorilla group). But it is usually seen in very dim light, where the structural features are barely visible. The nestbox and the branches are the only things that are not black, apart from the aye-ayes' features.