I think an ideal format for kobo + debian would be a minimal debian install onto a 4gb SD chip (the chip inside current kobo-mini production) ...
All practical apps (for small EInk screen would be possible) no extra chip to buy) ...
Partitions remain as original so that kobo upgrades would still work
- just expand space for debian (there is ample room).
Solution is minimaly intrusive and entirely in software alteration.
Just my 2 cents
Later
2bits
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