Just the idea of a "conversion interview" seems nuts. Interviews are a way (albeit imperfect) for you to gauge the likeliness that a candidate would succeed in

Just the idea of a "conversion interview" seems nuts. Interviews are a way (albeit imperfect) for you to gauge the likeliness that a candidate would succeed in a position. If you've already worked with the candidate, you already know this so there's no point in having an interview.