I wouldn't know how, but I doubt it would involve much more than recoding parts of the Controllers, and replacing their model with something more suitable. I've never seen it done before though, so I wouldn't think anybody would have any experience with this kind of thing, especially here (there are barely any at TWHL)
By the way, since when do Alien Controllers fire large homing balls heh?
Uh, I don't know, since ever?