I suspect that about the best you could do is for each user to have a text file containing their personalisation details in a standard format, with a macro in the document template to read that file whenever a new document is created from it, and populate either various built-in document properties, a set of custom document properties, and/or specific ranges (eg denoted by bookmarks) in the document.

__________________
Cheers,
Paul Edstein
[Fmr MS MVP - Word]