OK, I'm a big text adventure fan too, as well as a programmer and hobbyist electronics tinkerer, and you gave me a great idea.
I want to take this cheap wireless home theater keyboard and see if I can replace the touchscreen with a tiny OLED display and power it all with a simple board running Linux for text adventure games. The biggest challenge might be getting everything to fit properly in the case, but if I can make it work I'd have a portable text "game boy"!