How do you communicate with sk6812? I seriously consider them but 3-wire leds are problematic using directly from Rpi. The problem is not only LED count but also refresh rate. Old solution for analog era could be not enough. Even on the lowest FPS for grabber and 60leds/meter I could be forced to abandon smoothing. I was thinking to forward data from Rpi to Arduino(USB) or ESP8266 but the serial port is bottleneck for the first and latency could be a problem for second. Or to experiment with Olimex ESP32 or Tensy?