Goodness. The grammar is correct, but you've lost the meaning.
"Der große deutsche Blues" sounds like a famous music style in the 70s, whereas
"Großer deutscher Blues" could entitle the great depression of the late 1920s.
Neither does make sense. (Never trust a Bayern fan... ;) )
Honestly, the German lads came to City to kick and eat and live and talk the English way. It's your forum. I also truly appreciate the symbolic act putting the title in German. But before we lose the right meaning, and us Germans like to read and write in English - just put it YOUR way. :)
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Back to topics, I've never heard of Trautmann before me mate from Manchester told me about it. What a great story that is. Knowing the circumstances back in those days. I always like when football is more than goals or titles and when it comes to a better understanding, or just call it respect.