If the touchscreen is only for navigation or on screen keyboard then perhaps something like the Neonode is using could be good. Neonode is a cellphone manufacturer that promised touchscreen before more or less everyone else (2001 2002) thorugh using a optical matrix of leds. . Light beams form an invisible grid over the screen and finger location is detected as the beams are crossed. They was not first with this but I think that they are the only one that is using this right now.
The company itself is a mess and have had delays and do not have a good reputation but the technology could perhaps be useful for a ereader, it dosent affect the screen in any way.
Just a small potential tip
