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Sure, you could hack the field circuit of the alternator to increase its output.
But if the battery is already fully charged when you temporarily increase alternator output, you're not really gaining any efficiency.
Several automakers are incorporating this kind of "mild" 12v nominal regen in their vehicles - BMW comes to mind with 12v regen on engine over-run and when braking. But they're also intentionally drawing battery voltage/state of charge down in between regen events for the efficiency gain. (IE. not just under full throttle conditions.) All computer controlled, of course: if the SOC starts to get too low and the driver isn't providing any "regen events", normal alternator function resumes to protect the battery.
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