NetGain Technologies has a system that would fit the bill, but it's not cheap and like BW said, the diesel swap will keep your hands full.
Truth be told, just doing the diesel swap and making sure that gearing is right will give you a pretty big gain, and you will not have to add complexity with the hybrid system.
What engine and trans are you contemplating for the Wagoneer?
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Volvo WIA42 VED-12 / 335 hp / 1300 ft/lbs / 9 mpg
Big n' Boxy, Never met a Hill it Didn't Like
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