Matt, if you PM Nick P, he has fitted the 6-speed MT from the E39 M5 I believe, to his 4.6iS.

Build thread is titled "4.6is 6-speed manual" and I believe he hails from Germany.

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2018 Ram 2500 6.7L Cummins 68RFE
19k miles -Bright White/Black - Big Horn Sport - Crew Cab Short Bed
2013 X5 35D (CEO's) - Born on 5/17/2013 -
82k miles - Alpine White/Cinnamon Brown/Premium Pkg, Sport Activity/Premium Pkg and Sound/20" Style 214/Running Boards