Welcome again to the fam!!! the wait is gonna suck but it'll be worth it....for the wife at least
Unfortunately if the car is already in production, it's too late to make changes. Unless the dealership is willing to bite the bullet and sell that optioned car to another customer. Don't worry though when you get your own BMW, you'll option it out the exact way you want it. Cuz we all know once you get behind the 135 you wont want a Suby anymore
As far as the production numbers....dealerships have their allotted production slots. When a customer orders a car...sometimes all they need to do is modify/tailor a car they had already placed an order for. Hence why someone might get a number earlier than another...even if ordered on same day same dealership.