I had a similar problem a couple of years when I wanted to change the spec on my last car dealer said too late so I contacted VW and they did it for me no problem , so it may be worth you trying them
Just got off the phone with VW customer care. The bad news is that it's definetely too late to add anything, because, the GOOD news is that my car is at 'build stage 8' and will be coming out of build tomorrow!!!!
Anyone have any idea how long it then takes for me to get my hands on it??
Spec - 3 dooor, CSG, PP, Standard Nav