Early on in digital history (about '92 or '93), a very similar product was being developed and shown at trade shows. I don't remember who it was that was trying to do this.
Yes, I remember this and it never got off the ground. I assumed it was marketeers who thought more money could be made by selling completely new cameras, with no end to bells and whistles on future new models. But I always thought the digital cassette with an image receptor on a film leader type configuration was the way to go.