I don't think it is necessary to cool the TEGS after key-off.
Once the engine stops the heat sinks will cool them down quickly even if the power drain is cut off.
The engine generally won't be at full blast shortly before cutoff. I don't park at WOT 
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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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