It was proposed many times ago, and it's not straightforward - indeed would need scavenging flashing code from multiboot.
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In the meantime - I've introduced .lzma compression instead of .gz one, for backup with compression. Results are much better - rootfs compressed image is about 60 MB, in my case. I've also updated charging script to more recent version.

Updated version sent to robbiethe1st already, so I hope we may expect some kind of update soon We've also discussed possibility of using Pali's bq2415x_charger module for charging, (instead of charge.sh script) for kernel-power users, and depending on i2c-tools, instead of providing i2cget and i2cset as separate binariers, with backupmenu.

/Estel