We have looked at the pearl screen, and we will probably go to it in a future release. We may have to do something mechanical though, the glass on the pearl is so thin that we are worried about it breaking.
We assemble the resistive touch screens to the e-ink panels in house under a stream of ionized air (which blows off dust) and that process works well. Trying to get an adhesive laminate down with no bubbles and no air might be a bit of a trick.
I hope that eventually the touch will just get integrated into the top layer of the display.