That while I've seen such the quality is so low that I will not buy them. You can find ereaders that don't have such but check the reviews and it's no sale for me.
Why must you modify the Kindle when it does have a WiFi off setting? That way you control that when you need it?
Also, there are some thousand android tablets that do ereader duty just fine. I hear you about the other requirements but such a device may be rare or low quality. Just flip the off switch on the WiFi and we're done.
Silly question perhaps, in particular here, but that's exactly what I would ask Santa Claus for: a tiny thing that fits in my hand on which I can read the Ebooks I already own or the ones I choose to download to my PC.
No WiFi then, no colors, no internet browsing, no news, no music, no games, no beer tap... just a small gadget to replace a paper book (or maybe a few thousand paper books) when I'm away from home.
In particular, being at the moment the not-so-happy owner of a Kindle 4, I'd like to avoid that someone may peek over my shoulder to see what I'm reading or may tamper with my files without my consent.
So far I got rid of that eventuality by lobotomizing my Kindle (just a matter of removing two small capacitors thus gagging the WiFi), but in the course of the operation a few small plastic latches broke down and fell off, so I had to close the patient with duct tape and now I have to refresh the duct tape every couple of weeks
Still, if Santa Claus didn't run out of patience before such an unreasonable wish of mine, I'd ask him also to be able to arrange my books in a tree-like fashion without having to juggle half-an-hour with Calibre.
And if he didn't tell me to go to Hell and stay there until further notice, I'd beg him too for the possibility of correcting small typos (or scanning errors) there and then before I forget them, even if I'm on a plane and the nearest instance of Sigil is several thousand miles away.
Am I asking too much? Most likely yes. But I remember from an unspecified book on Murphy's law a very nice "don't believe in miracles, rely on them ".
Is anyone here conversant with miracles?