I'm sure you can reduce bias in this way but it still feels incomplete. I'm thinking another (more efficient?!) way would be to teach interviewers to detect and manage their own biases, both positive and negative.

For example if I'm interviewing someone for a technical position and they're very attractive or even dressed/groomed excessively I'm making an effort to not hold that against them. I'm aware that I have a bias on this so I'm actively trying to have a balanced perspective during the interview.