Here’s a template for Kicad 6+ you can use as a starting point to design your own shield.
The template/project has its own little library of parts in case you’re looking for something to get started with. Pots, switches, jacks… Most of these parts are available via Thonk.
Thanks to @AltCircuits for converting the project into a template and adding documentation.
(edit 2025-05: updated link)