Here's an idea (perhaps naive): why not add all the methods and give them optionally to the programmers. E.g. - normal interview is mandatory (you need something to base your ideas on) - portfolio is optional but when chosen it weighs heavily - take home project is optional but when chosen it weighs heavily - etc.

With 'weighs heavily' I mean that it influences the criteria for which those methods are good for.

The downside of this is that interviews are more unstandardised, which is a trade-off worth considering.