There's a video (or two) about the development of the Q50 Eau Rouge and how they got to where they got with the configuration of the prototype. When they got to the decision of using the GT-R engine, there were several reasons why they didn't go with its transmission. The first one? It didn't fit - the platform of the GT-R was designed around the chassis and powertrain. It was never intended to be a "volume" car per say, and they had the luxury of doing whatever they wanted with it.
So the transmission choice for the Eau Rouge concept? The M56 7AT (with a few tweaks). The Q50 Eau Rouge was created with a single mandate - raid the parts bin. There were to be no one-off parts. It is a GT-R motor with the AWD system and transmission from the M56S. This is why, as a concept it was completely driveable.
This circles back to my belief in shoehorning the existing 6MT into the next gen Z. The gearing is fine, and if it needs some tweaking, they can pull a 2015 Nismo and modify the final drive on it and bill it as improved acceleration or, in the opposite direction, improved fuel economy. Also, if the M's 7AT can be mated to a VR38 without extensive rework, then the Z's 6MT can be mated to the new VR30.
If the sales tank on the next gen Z, then you haven't built a new transmission that can't be used in any other model. You haven't designed a platform that won't be used elsewhere. You haven't built a motor that isn't being used elsewhere.
It doesn't get less risky than that for an automaker, honestly. All the pieces are there. It's just a matter of putting them together.
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