This is an eerie coincidence. Just before bedtime last night, I watched a video ( https://www.youtube.com/watch?v=lfp8Kwm5zTA&t=545s ) on Clint Basinger's LGR Blerbs YouTube side-channel about a miniature reproduction of the NEC PC-8001 ( Pasocom mini: https://www.pcmini.jp). This is a quite detailed miniature of the original 1979 computer powered by a Raspberry Pi Zero under the hood. Clint noted in passing that the keyboard isn't functional, and I thought to myself, why not? It isn't a cheap trinket, this thing costs about $300, he said. Also, I thought, a real keyboard can be pricey, but it should be pretty cheap to make a novelty keyboard out of low-cost SMT microswitches, or "tacts" as my South Korean engineer friends call them. Lo and behold, I woke up this morning to see this project. Great work, Excursion Gear. I wonder what applications could come from this project? I'm reminded of a mentor who had a Casio(?) wristwatch with a tiny keyboard and a calculator mode. Could one use this keyboard to make a text-messaging wrist watch? You'd need to carry a toothpick around to enter your text, but still that would be cool.

Some of those button-rich calc watches had a pointy key pick stashed in the clasp. Concave button tops captured the pick point. So - people have spent money on this before.

I really want a blackberry keyboard, only that tiny bb keyboard, not the phone ...

That looks an awful lot like the Raspberry Pi Pico board. NIce job fitting the footprint and using the castellated edges. Do you have any updates on the progress of this one?

One trick I learned from @Voja Antonic is that angling the buttons might help back them in and looks really great. Not sure you need that here but it popped to mind: https://hackaday.io/project/80627-badge-for-hackaday-conference-2018-in-belgrade

i prefer planck(chocolate) layout

That's quite a feat of layout. Looking forward to seeing it work.