They probably will not change it for you once it arrives- they do not have wheels sitting around, and would want to be paid for the $5000 it will cost. I idly wonder if someone here would trade...although I thought the 20s were a $$ option with some package

I find it hard to beleive in 6 days the car is in production...are you sure the dealer is just not being lazy? Call the BMW order line and see what the status is for your production number. Escalate to the manager if your CA is slow dancing you.