I may be saying something dumb now - but how about switching the alternator by a contactor and pressure switch in the throttle house?
Before the engine turns over there will be no vacuum and the alternator would be switched off.
When it starts running it draws a vacuum and the alternator gets switched on.
When you floor it (WOT) it switches the alternator off again - you need the extra few HP then or you would not floor it 
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gmeter or 0.13 Mmile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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