You often see old basses with just the top piece of the break replaced; usually a piece of purfling is run into the joint to make it look intentional.
Perhaps, if the upper part is the worst, and the lower part of the back is relatively sound, you could just replace the top piece and button? Butt-glued against a suitable brace, it will be just as strong as the ribs are glued to the blocks ...
Actually, to me the picture of the top part doesn't look so bad from here; if you can't bring the crack together, you could glue in a maple fillet to fill the crack, cleat behind, a new brace, a pufling strip across the break and its almost as good as new. Well, maybe not new ...
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