If you lose both engines on the C++ the flight director will decouple, because one of the AP has dropped off line, because you've lost one of the electrical busses.
To go down that road you'd have to be speculating that with horns going off in their ears and the caution panel lit up like a Christmas tree, both pilots would keep sitting there with their arms folded.
I think this lead is a dead end, but if it leads to an awareness that automation needs to be properly understood by the pilots, then it is not necessarily a bad thing on this thread.
Will any helicopter continue to fly coupled to the Flight Director with both engines flamed out? How about your 225 HC?