Are you sure? I've only used it once (On a 2020 G30) and I'm pretty sure I was able to select the option using the iDrive controller.
This would seriously annoy me as well, one of the few reasons I'd spec a new car instead of used is that its often hard to find the trim you want in a used car. Can they not swap for another available option, ie wood or something?
Too late to change it now they have said, its almost built. Now if they had been proactive and contacted when they first knew and offered alternatives then that would have been okay but nobody at BMW thought of that.