I am building 5x5 prototype based on corne keyboard wich uses sk6812 leds. So i can use sk6812, but with custom firmware, right ? That helped a lot. It seems a lot of fine tuning, but i think i can get trough it. I tried modifying XD96 firmware to support more than 32 leds and get them brighter (50/255 by default), but failed. Only with
https://kai.tkg.io/ managed to get full brightness. Either way, thanks for helpful info. Also, with custom i could make each key light up in my programmed color ?