Searching for ODF through yum revealed a package which looks quite interesting to me:
odfpy.noarch : Python library for manipulating OpenDocument files
Being curious, I installed ODFPy, and to my surprise, the package also provide some scripts to automatically convert ODF to several text based formats - odf2xhtml,odf2mht,odf2xml and odf2war - just what I was looking for. Looking at the available libs, theres also odf2moinmoin.py.
While not perfect, the conversion works fairly ok, plus, if stuff does not work correctly, the scripts are in Python and from a quick glance, they looks quite easy to adjust and enhance.
Might be fun if can integrate this with Plone. ^-^