If the hardware keys were in the "nice to have" section, I'd have written a bit about modding a tolino with a huge sd card and root because it's (old) android with adb enabled from factory, some models are easy to open and the system is just on a tiny micro sd inside.

As mentioned: No hardware keys, but a reasonable good touchscreen mostly insensitive to smudges/finger prints. FBreader runs OK, but memory is severely limited.

If someone is interested, I could write up some pros/cons and so on nonetheless.