programable keyboard

[SiliconWizard]

A normal display would pretty quickly get image burn.

An LCD gets image burn?

Yep. Definitely not all equal though.
But I do have a lab power supply with an LCD display (with backlight) which has been used a lot on the same settings. It now has a very noticeable shadow on some pixel areas especially visible with the backlight. It doesn't make the display unusable at all, but it's definitely noticeable.

[Nominal Animal]

I just received a couple of two-touch capacitive touchscreens from Buydisplay (2.8" with FT6206 and 3.5" with FT6236), but I'm leaving for the frozen wastes of Hoth for at least a couple of weeks.

The 3.5" one is almost as large as the touchpad on HP EliteBook 840 G4; the 2.8" one is about 3×4 fingertips.

If one intends to have both buttons and a pan/zoom/scroll area, I think an even larger one, say 4.3" with 5-touch FT5206 would be even better.  (The 2.7" e-ink modules are only a little bit taller (57.3mm × 38.2mm visible area, 70.4mm × 45mm physical) than the visible area of the 4.3" touch panel (95.6mm × 54.5mm), so two 2.7" units would cover the entire area, more or less.  Or one unit for the button area, leaving the pan/zoom/scroll area without e-ink.  Modularity for the win, methinks.