It's called a chocofi https://github.com/pashutk/chocofi

It's based on a corne. I've got a bunch of bare pcbs available still if you want some, will just have to pay postage, I'm not really going to be doing anything with them.

Do you mean keys thst you hold down with your thumb while your fingers are on the home row or something else? For the former, I use split space keyboards and map the left one to enter on press, layer on hold, the right one to space on press, and a different layer on hold. That gives me more keys that you would get on a 70+ keyboard. I find this considerably easier than trying to use pinkies on shift and symbols on what is my top row, qwerty row.

Typically, I map tab and the traditional enter key to tab on press, another layer, and backspace with the same layer as tab. This layer I use for window management in sway for home row and anything else I am missing that I really want.

I code with mine on a daily basis with work. Best change i ever made for ergonomics and reducing RSI.

Thumb clusters so come in clutch like. Whenever I see a birthday Hertford I just think about the massive waste of space the space bar is on them.

For escape and whatnot I use combos so pressing the two leftmost keys on the top row at the same time press escape. The ones below that, tab, and below that ctrl etc. and i make modifiers like control and shift one shots if I don't hold them down to help reduce RSI even further and so it's easy to hit keys that they may be "covering up" as a combo.

‘~Esc$&:;()[]{}<>=+*

Other than it being your password, why?