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I'm 110% sure that job would fall in the hands of one of their GT/DTM drivers. F1 guys tend to be contractually obliged to drive only the F1 cars, these days. Well, save for a few exceptions like Fernando.
Like you pointed out Ferrari had their drivers test their cars, Seb has done it too. And actually Lewis was supposedly the development driver for the Project One. Which makes sense considering the car is his F1 car with a road car body over it.