I think that we will have to be convinced by quality. In particular I am concerned by the lens. I understand that the prototype had an f3.5 and this rings an alarm bell; is it a crude triplet? For Ł650 I would expect a lens that is at least as good as that on a Zeiss Super Ikonta plus modern coatings. I suspect that a very simple Tessar design (4 elements in 3 groups, for 6 by 7), fully optimised and with modern coatings would give a good run for its money any modern complex design for 'C' size after taking into account the reduced enlargement required for final presentation.
For me, scanning the 6 by 7 negatives would also present a problem since I scan with a 35mm Superscan 5000. I would not be bothered about processing the negatives, indeed I processed some Delta 400 only a few days ago after an interval of some years. I found it very nostalgic and very satisfying. Nothing, however would get me to set up a wet darkroom for printing again.