I finished a prototype and also added a WS2812 RGB LED.
The prototype works as I expected.
If anyone is interested in manufacturing it please contact me at firebirduino@gmail.com I will give you Gerber files and BOM with 100% open source.
Since the Teensy 3.2 is discontinued I think that I may be able to make some Teensy 3.2 compatible boards to help anyone who needs it. My board will include a LiPo battery charger, Qwiic and USB-C connectors.
The price is $25 each. The...