I decided to make the final jump. Even got the old individual blog posts under MT redirecting to the new blog entries in WP as described by Alex King’s excellent MT template. Most of these work, althou so far I have found that for some strange reasons a zooomr.html post when being imported into WP was mapped to zooomr-2, so the redirection failed.
The next thing to do is to set up some sort of error 404 not found notification to find out about broken links, but I don’t think there is any way to fix it manually.
I might eventually implement the old “Sidewinder” theme on WP for this.