I have a Goffin and 2 Amazons, but the Amazons are not mechanically inclined like the G2, and right now my G2 is being cork-obsessed.
I'm in the foothills west of Denver. We'd be willing to try though.
Have you thought of having The Gabriel Foundation test them? That would be perfect, and they really know which birds would give them a workout, and I'm sure you would be welcome to observe.