It might be possible but the folder structure looks prohibitive. I have the following structure to get to my signature (using Outlook 2011):
/Users/steelc/Documents/Microsoft User Data/Office 2011 Identities/Main Identity/Data Records/Signatures/0T/0B/0M
Inside of that directory there are two more:
Both of these contain a file which appears to be an Office document containing my two signatures. The 0K folder corresponds to my default signature and the 120K folder corresponds to my other one. Neither of the file names contain the name of the signature itself.
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