This may have worked in Europe but not in America.
VW in America is not seen the same way as in Europe. Too many decades of marketing of the brand being an affordable car.
This is why the W12 sedan failed here. Slap Audi on it and it would sell at higher prices.
I enjoyed this article. In a similar vein, Henry Ford considered adding an upside down V8 under another V8, creating an X16 on a common crankshaft. I don't think he did much with the idea though.