As someone who might be looking for a Job - the clearance bit drives me nuts, its a chicken and egg problem. You can't get the job without it, but you can't get a clearance unless your in a job that requires it.
If you look back at your comment "because no one has presented a skill set strong enough", a security clearance isn't a skill and with that in mind i'm sure if you look over the people who have applied you would find someone with a strong skill set, if not let me know i might know someone. My recommendation is remove the requirement of the clearance, add it as a requirement to be able to get a clearance and then sponsor your strongest candidate.
Other wise your are basically limiting your pool to people coming out of the military or for some reason left a cushy government position.