it seems sensible Bell is making this change.
Agreed. However, this is poor human factors design IMHO. Now, it would seem appropriate to (re)place a guard over the AUTO/MANUAL switch to avoid inadvertent operation which may result in an overspeed. It would seem that the only need to operate this switch now is to silence the FADEC warning horn in the unlikely event of a reversion all the way to manual. Raising the guard would seem to be a reasonable tradeoff to prevent hitting the button in error.
If the FADEC manual mode check is too much for them I guess than they shouldn't be flying at all.
As is often said of aviation "calamities." there are those who have and those who will.