After tinkering with Python, C#, and multiple versions of Blender and Unity, I've got a DCBlap level running on OUYA!
Converting the old level files requires an old version of Blender I had to run under WINE, as the Mac version was only available for PowerPC at the time and the newer versions changed the Python API too much to run my old import/export script. After converting the level to a .blend file, I had to invert all the polygon normals in order for Unity to render everything correctly.
Getting the physics working in Unity was pretty easy, though there was an amusing moment when I accidentally enabled gravity and parts of the level started falling off!
Haven't decided whether I'll continue developing this into a complete game yet, but it was certainly a fun weekend project.