I was hoping to be able to flash the new machine without ever booting it, much less going to the trouble of jailbreaking and installing little pieces just to be able to boot from an SD which I would have to build separately. That's why I mentioned the Windows machine, where I have Nokia's flasher. Isn't there some way to make a Nokia flash file out of the rootfs.jff2 file?
Anyway, if it makes things easier, I also have an x86 Ubuntu Linux (and an AMD64 Ubuntu, x86 Mac, and PPC Mac!) all sitting on my desk.
flasher -F fiascoimage.bin -f flasher -r rootfs.faster.jffs2 -f -R