I doubt very much an arrows shaft is going to do it. Compression strength increases with diameter significantly (something like diameter^2 or diameter^3, Rapt will know), something on the order of a hollow carbon hiking pole like gnome's or fatter is the way to go I think.
BER is taking one for the team, he ordered some hollow carbon poles over 0.5" in diameter. If we hear back in a couple of weeks or so we'll have data. If we never hear from him again, well then I guess it didn't work