Well, having sat in a CS this week, the centre tunnel does look very nice, and lacks the rear seat vents.
So fitting the low profile centre tunnel trim from the F22 - which also has no rear seat vents - would be in keeping. Would need to get the trim panel that clips on top refinished to match the rest of the interior, but that's not difficult.
Or one could just fit the centre tunnel trim that's the same shape as the one in the F87 but comes without the armrest assembly, and swap everything else over.
Part numbers for both items appears here:
https://www.realoem.com/bmw/enUS/sho...diagId=51_8582