Anyone know a way to achieve this? I have a player who's always trying to emulate 'old school' aspects of various classes.
I don't know of a RAW way, but if he takes Alignment Channel, you could homebrew feats that duplicate Turn Undead and Command Undead for the chosen alignment subtype. I feel like outsiders are probably more powerful per HD than undead are, though, so maybe put a lower maximum on how many HD of outsiders he can control.