The idea is good, but if you are explicitly interviewing I would add an honorarium to the whole thing. This way it's not officially a probation - the candidate

The idea is good, but if you are explicitly interviewing I would add an honorarium to the whole thing. This way it's not officially a probation - the candidate can even say they were freelancing during this time - so the CV problem doesn't come up AND you don't look the tiniest bit like you are exploiting people.