For example, he pointed out that a simple code change will allow the EGPWS to say, instead of “bank angle”, something like “roll left” or “roll right”. He would like to add an arrow in the middle of the ADI pointing the way to roll upright.
I hate to say this, but isn't this a classic example of re-inventing the wheel? All this is basic instrument flying skill taught way back in the 1940's requiring interpretation of which way is up on the artificial horizon and use of the sky pointer. This can be practiced in a cheap desk-top trainer yet it is amazing how few airline pilots not military trained still do not know how to read their flight instruments much beyond a rate three turn - and no idea how to safely recover to straight and level if upside down in IMC..