So I am another person who, just like you, spend quite a bit of effort trying to find a way to get an eBook reader touch typeable. (though it did not occur to me to contact a hacker: I got stuck in trying to contact companies who manufacture them.) And I find it so hard to believe that the one person who put in more effort into getting this project accomplished than me only got his Nook Simple Touch touch typing recently.

So actually, I am also in the process of changing the keymap as I post this... I'll let you know once it works out.

As far as the hub, of course you do realize that it requires an upstream-powering hub, right? And, from reading the XDA threads, it looks like maybe also some sort of minor code change (to stop supplying power in the Host mode)(though maybe a simple command over ADB would do it). Would you like to work on this, while I work on the Dvorak keymap?