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The immediately available migration route would be through OPML and Omnioutliner professional.

The Freemind accessories folder includes XSL templates for MM <--> OPML conversion. (opml2mm.xsl and mm2opml.xsl)

Omnioutliner opens and saves as OPML.

Omnifocus opens Omnioutliner professional files.

To export from OF to OOP you can use this script.

All of this could be automated, in both directions, through a pair of shell scripts.