I designed an adapter for the Retroflag SuperPi Raspberry Pi Case that allows you to use it as a Playdate charging dock (with a few modifications).
I split the design into two pieces to allow it to be printed with fewer supports. You'll need to super glue them together after printing.
I also designed USB plugs that mimic the Super Famicom.
Build guide is here: https://alexmeub.com/playdate-retro-dock/
The author marked this model as their own original creation.