Interesting Mr.

I myself would have tried going down much different but I don't know how it would have worked not being there.

First I would start the ICE and drive to the downhill where the FEH would roll down on it's own. Then, shift to "N" and turn the key off and back-on within 3 seconds. Leaving the key on will still provide power steering and power brakes. With the key on and using power steering, brakes and everything else, the HV battery will drain fairly fast, but your burning no fuel. In neutral, you cannot restart under 6mph so you would have to increase above 6 to key start or stop and shift to park. Depending on how cold it is, I may get to use regen in "L" to let the rotors and pads cool down, but I would have to restart the ICE for that. Of course if you run long enough to go EV while in "L", you would start saving gas again. At any rate, your brakes would get some time to cool on the way down.

GaryG