My ERCF v2 kit from Siboor came with a pre-soldered neopixel string for the ERCP. The carrier print didn't play well and kept breaking on me, so I designed a more ‘clip’ style to hold them. They fit pretty well and hold well, although they stick out just a tad more so I could reinforce the clip sufficient to withstand install.
I'm not a great designer, so this does need supports for the overhang on the clip.
The author marked this model as their own original creation.