Um, Jordan...you know it is the shoots your using to cook with right? Sorta like hearts of palm. Your cham might be able to digest the center part of the bamboo, or even a leaf or new shoot.
This might happen naturaly when hunting flies or insects on some crushed bamboo after a tree had fallen and knocked it over (you can use your own fictional scenario if you like) as the cham strikes the insect, it brings up some crushed bamboo, or a leaf or so. (I know you get the idea)
Don't know if you were in culinary school, but any food saftey coarse should have taught you the difference between contaminated food, food toxins, and food ilnesses. I think your concern here is with long term build up of toxin from prolonged eating of the OUTSIDE of the bamboo; Highly unlikely I would say.
I don't think there would be any illness caused by bamboo, (doesn't naturally carry any salmonella, ecolli etc) and your in control of contamination. So I would feel comfortable using it.