Keeper's layout are 34-key variation of the Watchman's layout. When using chords, it was possible to adapt Watchman's layout for 34-key keyboards with minimal changes.
The layout is not a universal solution, it is a source of inspiration
Copy qmk/* to YOUR_KEYBOARD/keymaps/default/
Just open link or upload kle/*.json to keyboard-layout-editor.com
Copy zmk to YOUR_KEYBOARD/config/