While you wait for responses... Proper has aftermarket wheels (I think 20")
https://f48.bimmerpost.com/forums/sh....php?t=1611638. You can also see a lot photos of other wheel options on the Photo thread:
https://f48.bimmerpost.com/forums/sh....php?t=1203549, but the models aren't always stated.
Hope to see more people post pics here because I've been debating a second set of wheels myself!
Personally I think this car could be a couple inches lower but at the same time as someone who goes to the mountains often, I appreciate the clearance for snow.