I was only giving my 2 cents although I would like the paddles I am not actively trying to perform the mod.

Never thought about swapping the wheel over actually to test this theory!

Will the wheel fit on the X5 and secondly how difficult would it be to remove from 135 and install onto X5?

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2009 135i M Sport Convertible
2008 X5 3.0si
2003 E46 318Ti M Sport Compact - donated to parents
2003 116i Hatchback - donated to brother
2002 316Ti - Sold
2000 318ci M Sport - Sold
1998 318i Sedan - Sold