In my opinion if you have something on top of your robot that could potentially carry the ball ( IE something with sides on it....) it will be considered illegal.
therefore if you decide on some type of chute system that IF your robot were turning when a ball is engaged by it and IF the chute would make the ball turn in the direction you are turning you would have an illegal mechanism.
A simple slanted flat surface would seem to be ok given this approach.
A u-shaped track or a flat surface with sides to guide the ball would not
by the way
I do really like the idea of referring to the balls as "possessed
"
Puts a whole different "dark" light on the game....
Good Luck and we will see you at the competition..!!