Not sure how fast this would work (probably not very) but The only thing I could think of is using ssh and sshing "private/var/mobile/Media/iTunes_Control" to your computer, then drag it to iTunes, should keep your lyrics artwork etc.
It would probably take quite a while tho (a few hours, I'm guessing... not sure tho, haven't tried.)
edit: I just tried it, it works.
it's actually not too slow either