Took me a while (mainly I've been distracted) but I figured it out. You're figuring out how to put the tools that allow you to make flashable images from within backupmenu, aren't you?
Now to just figure out if I can get backupmenu to work underneath uboot (so uboot loads, you pick maemo kernel, and if that loads with keyboard out, it takes you to bootmenu/backupmenu). And then from there, if I can figure out how to run the flasher from on board in a way that flashes the other stuff but NOT the kernel, this device is one step closer to utter perfection.