I have a couple of Adafruit Circuit Playground boards and generally like the library that Adafruit has put together for them. I prefer to use FastLED to control addressable leds.
With this in mind, I have created a fork of their code that can disable their NeoPixel code if FastLED is included first.
If you are interested in using it, it is located on my github here: https://github.com/brencerddwr/Adafruit_CircuitPlayground