As I vaguely recall the throttle on collective was the result of a large potential sale in the early 1980s of As-350s to the Australian military who insisted upon it or “ Sorry Mate! No sale! “
Went for a back seat ride in the 341 when they were demonstrating it to the Oz military sometime early 70's, the seniors were not impressed with the throttle location, on the overhead if I recall correctly, they wanted it on the collective.