Final Fantasy XIII-2: Crystal Edition, Limited Edition, & Steelbook + Bonus [Germany]

[whtsnk58]

Not sure if anyone here can help or not, but I just got my XIII-2 steelbook from Germany today and I can't redeem the DLC with my American account. Anyone know of a way I might be able to get it? I was thinking maybe making a new gamertag on my 360 that is set to be in Germany and redeeming it, but I'm not sure if I'll be able to access the content from my American gamertag. I would assume that it would because they're both on the same system, but I don't want to screw myself out of a possible way of getting the content.