The problem: before anyone can give you the multiple-path template, you must supply the templates and the precise rules for choosing between the templates. The rules can look only at the metadata for the book. The choice specifically cannot depend on human intervention, because the human isn't available inside the computer.
Thus, if you can tell me what metadata should generate which save template, then I can give you a master template that makes the choice. If the choice is made because you know the answer but can't give the rules, then abandon hope all ye who enter here.
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