Despite the title of the thread, it seems you aren't looking for a stablemate for the 4.6, but rather a stablemate for the 4.6 and your
Corvette. You have occasionally lost access to the 4.6, and need to carry stuff that doesn't fit in the Corvette. The 540iT seems like the obvious choice, and it looks beautiful. You can get a newer one, with lower miles than the 7. And you won't see two twins to your car every time you drive into your street.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue