Maybe you could do a high-resolution scan of the piece as it is now, clean it up in photoshop (including removing Bowa's sig), and have a full-size color print made of that, and then proceed with acquiring additional sigs on the original.
Since you won't be able to get everyone's signature on it, maybe focus more on balancing it out so that all of the autographs are not visually weighted on one side or the other. Then you would have some display options, whether it be the cleaned-up reprint or the autograph-laden final product.
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