I'm pretty sure there was a digital back for Nikon, in the early days of digital? Lord knows they exist for medium and large format cameras, so you can switch between film and digital. Just like now you use different backs for color and B/W, or different film holders.
But of course, in the SLR world it's always been multiple bodies, not multiple backs for one body. I don't see this as being relevant at all now. Most of the cost of the dSLR isin the computer and the sensor, not the body itself, and you'd have to have both those on the "digital back", so.... If you want to shoot both, carry a FF dSLR and a film SLR both...
If the idea was to turn an older, film body into a FF dSLR on the cheap, it wouldn't be any cheaper at all...
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