I think that the twist grip throttle should have been standard right from the first AS350, you have an engine that has an emergency overide for the FCU so in the event of a governing failure you take it out of the flight detent and corellate it manually. Has to be a lot easier than swapping one hand from the collective to the throttle. The only trap with the twist grip is if the system is not rigged correctly, the pilot on the LHS can easily set the twist grip in the flight detent but the FCU goes into the low side of the manual control. That design fault and not being able to quickly remove / install the duals can only be blamed on the aeronautical engineers who were given the job of designing or approving it.