I want a clamshell that has one OLED/LCD screen and one e-ink screen.
Both should be multi-touch.
The hinge should pivot (like an omnibook) so that either screen can be visible when close.
Besides the obvious benefit of having a single tablet with both types of screen, in "laptop mode", the e ink screen could be used as a soft keyboard and touch pad.
Something like this in phone sizes could be really great too.
I too share your desire to code outdoor. When I don't find options, I ask myself if I should be dreaming of work/code when a part of me is trying to be in nature or with people around :P
I'd love something similar to the Lightphone but a bit smarter.
And a laptop or device I can code with outdoors at a picnic table in broad daylight.