C63 Steering wheel w/ functioning paddle shifters
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Why would you need a new wiring harness? (Genuine question btw...)
The paddles' functionality is already coded in the computer (I could see the computer acknowledging the paddles being pressed through Star diagnostic). No you don't have to re-flash the computer, but you do need master access to the computer to unlock the paddle shifting routines. That particular access is very uncommon outside of Germany(since it also lets you change the speed limiter of the car and other country-specific settings), so the chances of being able to accomplish it are low, but not impossible.
Just my $0.02



