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I like the 'electric supercharger' idea. I was considering the Mars or eTek motors, but the AC12 looks good too.
If you want to go direct-drive, you could always toss out the RWD portion of your AWD and directly drive it with the electric motor. As a side effect, if your batteries were getting low, you could recharge them by regenning slightly while having the ICE power the car.
Remember that in either case, you'll have some heavier batteries on board. That means you could power the PS pump and A/C compressor with a small electric motor (90VDC treadmill motor, perhaps?) and toss the alternator for a DC/DC converter, reducing parasitic drag on the engine.
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