While I understand your position, hiring good programmers takes more than just knowledge of their medium. Hire the top 3 as temporary employees to see how they fit with your company then after a few months let 2 of them go and keep the best. A good work ethic and honesty can only be measured by experience with the employee and not from a resume.
To gauge their knowledge of the medium, show them what you're working on and see what kinds of questions they ask about it, that's a great way to gauge their experience.
While I understand your position, hiring good programmers takes more than just knowledge of their medium. Hire the top 3 as temporary employees to see how they fit with your company then after a few months let 2 of them go and keep the best. A good work ethic and honesty can only be measured by experience with the employee and not from a resume. To gauge their knowledge of the medium, show them what you're working on and see what kinds of questions they ask about it, that's a great way to gauge their experience.