Euge, it was me who got the option to reorder.
Doesn't sound like you're going to get anywhere via the current communication channel.
When I originally raised the issue with my dealer they were communicating with VW and then back to me. I was offered the same solution and whilst my dealer was really sympathetic they said there was nothing more that they could do.
They suggested I contact VW Customer Services directly. I did that and made a formal complaint based on the fact that to me the DAB is an important feature and that the van was not supplied as advertised.
I went on to add that the suggested solution of an aftermarket non integrated DAB wasn't acceptable on a vehicle costing £50k, that I had made the decision to buy a factory built camper to avoid aftermarket fitting of options (e.g. parking heater), that the AutoDAB would degrade aesthetics and usability of the van, and finally it would affect resale (all UK T6s have DAB as standard not just Californias).
I don't think I made a fuss but I did stick to my guns. I didn't get anywhere close to talking about my rights, just explained I was one unhappy camper (excuse the pun).
I've worked in complaint handling in the past and just because one person gets a particular outcome doesn't mean everyone will. I did raise my concern with the dealer on day 1 of ownership so that might have helped. But I'd been in the van for over 3 months when I lodged the complaint.
It has to be worth a try?