I think I'd have been tempted to get rid of them entirely. The 6 Series is a fantastic car but those wheels have the typical issue you get with wheel designs introduced as part of a facelift, they were not designed at the same time as the car and never seem to look quite right.
A set of the original 19 inch wheels would have improved the ride quality, looked better and also are an entirely painted finish so no more issues with diamond cut wheels.
Otherwise that's a really nice car - best colour, must be one of the last ones, so a 2016/2017?
I think I'll always regret the fact I never had one of those.