Following the reports on Stuart's web browser, people again suggested to use an old TI console and put a Raspberry PI inside. As I already said, at least MESS won't really run well on a Raspi, at least with its current performance, but faster models seem to come soon.
I got another idea that should be perfectly feasible: What about using the TI console as a USB keyboard?
Remove everything inside except for the keyboard
Attach the keyboard lines to the digital inputs of a microcontroller;