TLDR: Adafruit Feather 32u4 bluefruit LE + a 10000 mAh battery. Someone wrote a 32u4 QMK firmware for it. I also added Vial support! I’ll clean it up and PR it to Vial.

Only thing I wish it had was the ability to switch between Bluetooth connections. But QMK has pretty limited support. You can toggle between USB and BT tho. Which is sick.