I would say he could not trap him in a simple spin-around-blood-activate circle like toot, he would have to have something a lot more sophisticated than that. I wonder if a WCV would count like a Lou-Garoup, and you would need a circle like the one described in FM (1 layer for physical, 1 layer for spiritual and 1 layer for a mixture of them).
Ah, it reminds me of the scene in club zero.
Usually the WCV is as human as it possibly gets for anything on the weird side. So circle wise, they would probably be as affected as any human being. In times, however, when the hunger demon is close to the surface (while feeding or using a lot of their powers), they become a whole lot less human and more spooky, so in that case, a simple circle might actually work.
As for a WCV making a circle, I don't see why not. Usually though, they would not need a circle, because they can rip almost anything apart, that would be held back by a circle. And what they can't fight will probably not be impressed by a little circle anyway.