It is not that that they can't break it down eventually, but just how long do you want that dirty pile of poop to sit around while you wait for the bugs to do their thing? I don't think the pillbugs and springtails are a bad idea in a snake encolsure, I just don't think they aren't necessary if the keeper cleans up the waste. I clean waste piles as soon as I find them. Add the detritovores if you like them (and they can take care of any tiny bits that get missed), I didn't simply because I didn't want to spend the money.
English ivy, and potos can probably withstand a BP. I also have a short version of Sanseveria that would work with a low ceiling (the pointy leaves of Sans. can be almost thorny at the tip - be sure to trim them if necessary).