Look for Tamron Fotovix, or Fujix Photo-Video Imager... These things have about what you describe, output is an inverted (negative to positive) video signal which can be viewed on any video device...

But honestly these gadgets ONLY get in the way of what you should be doing, putting hopeful negatives in the enlarger and giving them a try because you are taking "time" away from the darkroom, and the impression of whether or not a particular negative will make a good print is fleeting.