If the position does not absolutely require legal training, how about....Zinke?
Retired SEAL (In fact, commanded SEAL Team 6 IIRC), took all of 60 days to square Interior away and....
Geesh, I've met and talked with the man a half dozen times and he would hit DOJ like a neutron bomb in the Fulda Gap.
...the heads would be 'sploding all over the Beltway.
As a practical matter, the position needs legal training.
Technically, you can represent yourself in ALL legal matters. Same sort of technicality assocaites with DAG, except DAG is a purely legal/lawyer type job.