I made a left handed version of the EPSON HC-45. The character layout is fairly standard, except modern JP keyboards generally use hiragana. Like the Beeb, this has a clear plastic thing over F keys.
I increased the screen size to 50x11 characters. Could be a modern nimble LCD screen with a nice filter. A receipt printer, speaker and battery could possibly fit underneath (the screen flips up). That or a regular cartridge slot. I don't know if these had a regular composite video out. Maybe.