Best practice for Tumblr import?

I’m a long-time nanoc user planning to experiment with Middleman for a new site.

At build time, I intend to “slurp” posts from a Tumblr blog, adding new ones to the Middleman content.

My inclination is to prepare a rake task and run it as part of my build workflow. Is there a more “Middleman way” to do this, e.g. through an extension that augments the build process?

Certainly someone out there has an opinion to share. I feel so alone.

I’d give a +1 and might end up building this… Or has somebody build something already?