I think the "single writer, multiple readers" argument applies here, better known as, "The man with one clock always knows what time it is; the man with two is never quite sure..."
I would strongly advise against maintaining writable copies of a document in both Word and MediaWiki.
You can produce PDFs from the wiki that are A4. I suppose you could even embed those PDFs in a Word document, if this is to fulfill the spirit of some organizational mandate.
:::: I think our [energy] policy is called "aircraft carriers." -- Irwin Steltzer, 1987 :::: :::: Jan Steinman http://www.VeggieVanGogh.com ::::