[ardy42]

> Even Latin, if you use enough languages with enough diacriticals. Or want to code in APL. Or use Greek letters when typing math.

I've always wanted something like the space cadet keyboard with a couple of extra modifier keys vs. what's typically available today for typing unusual characters (and the keycaps for making that easy).

https://upload.wikimedia.org/wikipedia/commons/4/47/Space-ca...

[myself248]

That's pretty straightforward to DIY with the TMK firmware. Or even just with Autohotkey and your existing board; pick a key you don't use much (Caps Lock, right-Win, etc) and make it one of your meta keys.

Print your own keycap labels with Avery sheets for starters, and once you've got the layout nailed down, you can send off to have custom caps made by whatever process you like.

[JdeBP]

Only 3 extra modifiers, really (a PC keyboard having 4, discounting left and right variants) and fewer actual keys (a mere 100) than an old U.S. 101-key Model M keyboard, let alone a modern U.S. 104-key Windows keyboard.