I'm curious. Why does pvc build bacteria naturally? Doesn't wood hold more moisture than plastic? (Unless you mean because the pvc is hollow. I can see it then.)Better yet some exo terra vines or natural disinfected vines or branches. PVC builds bacteria easily.
A healthy cham can fall a lot farther than the typical cage and not hurt themselves at all. Unless it has active MBD of course. Lots of foliage will give him a lot of structure to break any fall if he does happen to slip.If that's PVC I would take it out because they can easily slide off and break something..