Banjo
From the report it looked pretty clear that Hughes accident had absolutely nothing to do with spatial disorientation. Bit of a mystery I would say but best guess was that the pilot was simply not looking out of the aircraft (or at his AI/HSI) as he was preoccupied trying to change a radio frequency having probably moved his left hand to the cyclic in the LHD helo. IF that was the cause, it comes back to what I have been banging on about, and that is keep looking at what's keeping you upright - ie the ground, or if you are IMC, the instruments.
With regard to any 500 ft "decision height" for want of a better term, what on earth is the relevance of how long it takes to get orientated on instruments? The whole point is that you should never need to try!
And as for your advice on technique to avoid getting into inadvertent IMC, well sorry, but what a load of old waffle! That's not going to help anyone as they find themselves getting anxious about worsening weather.
Coorong
Agree wholeheartedly. Address that and some good progress might be made!