How did it go at the vets? Yuki just had xrays done two weeks ago, but thats in Tokyo. They of course needed to give him anesthetic in order to do them, and take a good look in his mouth and even took a biopsy of his inflamed gums.
I'd try calling another vet and ask if they can do xrays. Only thing I've been told they can't do is blood work in Japan. I'm going to try asking another vets about that but they should be able to take xrays if hey have the equipment, as its an In house service (bloodwork has to be sent off for testing and parently no company offers it in Japan for hedgehogs yet).