Hardware implementation of Free42/Plus42 other than DM42?

[BruceH]

Enter key is rather too close to the off key for my liking. :-)

And using it portrait rather than landscape will probably lead to RSI-type problems as you'd have to lift your entire arm up to reach the top row.

On the plus side, there's a Linux version of Plus42 so you might manage to port it to a small RPi or similar device which could be fitted with a display. Start by porting Free42 and then tell Thomas what changes you had to make so he can consider whether to do a Plus42 version.