I've just transferred a white background picture from my PC to the Hudl, displayed it on the screen, laid a 2.25" neg on top, photographed it from above with a handheld iPhone 6s and transferred to image to my PC to be converted to positive.
The result was quite good, but, as indicated in the YouTube video, the pixels on the Hudl screen are visible and would be more intrusive with a smaller negative. That could probably be overcome with some kind of white plastic sheet laid between the Hudl screen and the negative.
More problematic though is the fact that, whilst the Hudl screen appears to be an even white to the naked eye, the iPhone camera doesn't see it that way - it's brighter in some parts than others. I think you'd probably have the same problem, Henry, if you tried to make your own light source.
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Getting positives from old odd sized nega.. new
Getting positives from old odd sized n.. new