There's a new article on Michael's site on digital large format photography, written by Richard Sexton (
http://www.luminous-landscape.com/reviews/cameras/digital-ebony.shtml) In there he suggests a company called SK Grimes:
"SK Grimes Photo Machinist:
www.skgrimes.comA repair and fabrication shop that custom manufactures an adapter plate that allows a Canon EOS camera body to attach to any view camera with an international back, i. e. any Ebony 4x5 camera model. They also make special adapters for fitting barrel lenses, i. e. enlarging lenses, to Copal shutters."
If you contact them they might be able to make an adapter for your camera that would allow a MF digital back. You'd likely have to send them the camera AND back for them to make something though, and I don't know enough about the camera to know if this would work...
Mike.