How I found the 10 qualifiers was to use Project GC to tell me how many geocachers found geocaches in Alaska. Then I went down the ranked list and used their geocaching ID in the Checker until I found 10 qualifiers in Ohio. While this worked, it was tedious.
I know Project-GC checks premium members to see if they qualify for Challenge geocaches but is it possible to get a list of whom qualifies for a Challenge Geocache to satisfy a Reviewer who approves and submits the proposed geocache? I can pose this request under the request for checkers if you think that is where this question belongs.