I would make time to workout 5+ days a week anyway and do a BP split personally, either lifting early or late if necessary, but if you're limited to 3 sessions with no room for exceptions, I'd probably do something like Pull/Push/Legs.
Example: (keep in mind I've never done a split like this, just trying to write up something that hits all muscle groups)
Rear Delt Raises on Inc Bench
Straight Leg Deadlifts
Hack Squat machine