How about we give each of the non-converted Wikipedia a MediaWiki like this:
it2.wikipedia.org -> MediaWiki it.wikipedia.org -> UseMod
ca2.wikipedia.org ->MediaWiki ca.wikipedia.org -> UseMod
etc.
Then each of these projects can do the transition manually and as soon as they're finished they give us a holler and we move xy2 to xy and take down the UseMod install. An automated transition is problematic anyhow because of the lack of namespaces, different image handling etc. Any reasonably large wiki should have enough users to reduce the workload to max. 100 pages per user.
What do you think?
Regards,
Erik