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.tds and .twb files are all XML files
NOTE: manually changing the XML is not supported
I can tell you that others have been successful in using this XML structure to their benefit as a template by editing it in a text editor.
Scripts can manipulate XML
TABCMD can be used to publish .tds and .twb files http://onlinehelp.tableausoftware.com/current/server/en-us/tabcmd_cmd.htm
The general suggestions above can be carried out by a competent script writer who knows XML.
Please understand that Tableau Support cannot assist with hacked XML.
support for this kind of implementation is a good idea best expressed here: http://community.tableau.com/community/ideas