I am absolutely sure he wouldn't. What is certain is that he would have laughed at Michel Voncken's interpretation of baroque music (saw the demo at yamaha-europe) - that performance is a real tragedy!!!
Mozart's arrangements are much simpler than those offered by modern arranger-keyboards and his music has survived for over 300 years.
What I've learned from Mozaart is when composing keep arrangement as simple as it can be.
Best regards,
George V