Would a scanner work? if you have one try it or see if some one you know has one you can try it with. You may be able to fit like10 of them on the surface and scan 10 slides at a time. My dad has some also i may try it myself.
Ive seen these slide adapters on e-bay before that you fit on the camera and they have a fixed distance from the lens and a little light box or somthing that shines threw the back. The problem is you will have to go threw them all one at a time shooting each one. You put your camera into macro and shoot them at this fixed distance from the lens. It may shoot better quality images then the scanner i dont know.