My b2evolution Version: Not Entered

There aren't any working converters for b2 to wp afaik.
Has anyone found an if not complete, a good way to migrate from b2 to Wp ?

The first thing that comes to my mind is exporting b2 feed and than import that feed to WP. But that would cost a lot by losing categories, tags, users data, basically everything except post data.

Does anyone have better suggestion ?