It is possible to use morphologies created in the Apertium platform directly as spellcheckers using the libvoikko and libreoffice-voikko extension.
You can install
openoffice.org-voikko directly from Debian [sid] main, it is new enough to support morphology variant selection and works with SVN versions of
libvoikko just fine.
Once you have compiled the modified version of
libvoikko and placed the required files in
~/.voikko/2/mor-apertium you can start OOo with
Then go to
Tools->Options->Language Settings->Voikko, from the Vocabulary drop down box select "apertium: Experimental Lttoolbox morphology" and click OK. After that any text marked as being in Finnish will be spellchecked with Lttoolbox.