Contacting mags will not work because BMW are big advertisers and the mags simply would not be interested. I`ve had this when I looked after sales for a truck manufacturer and my response when a customer said "i`ll go to the press" was "go ahead"! Believe me, the mags won`t touch it and you`ll lose any help from BuMW.
I completely agree with dreamer on this and the best way forward IMHO is to get the factory technician check it over with you in attendance and I`m sure it will be sorted out. It`s not in BuMW`s interest to abandon you. I actually think they are being pretty helpful given you decided to ride it from Berlin after they said don`t. Most manufacturers would tell you to eff off because you ignored their advice.
I don`t work for them by the way but do know how big manufacturers work in these situations.