So I couldn't just drop the OAuth library into the plugins directory because I didn't have sudo rights there, so I wgot and zipped it and uploaded it as a plugin via the web interface and changed the include to point there. And now the end of the bifurcation era may be in sight. Not there yet, but the first 25 posts got transferred out of a mere 2,725 and 1,943 comments (before we get to thinking about the Enetation ones, I've got the dump file somewhere, and that'll make a python project for one of these days).
Meanwhile, has anyone got experience of running XBMC or one of the many other Linux media centres on a cheapo Android tablet or netbook device, preferably with the content somewhere on a network? I'm thinking of building a not-a-hifi system that lets me have different music rooms - just because I can.