I agree 100% The Z has to remain a stand alone in the Nissan stable.
If there is one positive esthetically, the grill is better proportioned in the concept SUV due to its higher stance.
Here's a review: https://www.hagerty.com/media/opinion/z-sus-is-just-alright-with-me/
The 240 had an attractive (although useless) bumper that occluded the view of the lower half of the grill. Here's hoping the 400 grill height can be reduced by a 1/3rd to approximate Ante's law of proportions. In the alternative, divide the grill horizontally with a band of chrome or brushed metal.