Training and teaching is hard. "One hour of interviewing could be avoided with one hour of training" is wildly optimistic.

It also ignores the breadth of knowledge you likely want a candidate to have (and are just trying to sample at through a short few interviews). How many hours of training are you willing to sign up for? How confident are you that the knowledge will "stick" for any given candidate? Are you going to fall back to GPA and school prestige to measure how well they've retained knowledge in the past? That seems like a step in the wrong direction.