Or more pratical: a partition on the SD card of your phone that can boot to a live linux, then store the live data locally in the ext2 part I did try to do tha

Or more pratical: a partition on the SD card of your phone that can boot to a live linux, then store the live data locally in the ext2 part I did try to do that with my android phone, but apparently it requires some specific kernel modules. I've to figure out which, and how to cross compile them for the phone kernel.