I've judged some shows...frankly, I might be interested if not for the sheep & goats! I do have a few ideas though...
Are you close to a college that might have a judging team? A small junior show is good experience for an accomplished undergrad who has judged & trained, and most of them would jump at the chance. If you'd prefer somebody with more experience or maturity, you might also find a coach or instructor through the same college route.
Extension staff? Not always my favorite idea, but there are some who have plenty of experience & will do a good job.
Purebred breeder or cow herd manager in your area? These folks have a practical knowledge, and many are articulate enough to handle the reasons...IF they'll do sheep and goats!
Good luck. Hope that helps.