@james211 I use this lightpipe with success. Stick it or hover it close to the RGB LED and leads to a hole drilled in my enclosure. https://www.digikey.com/product-detail/en/bivar-inc/PLP2-1200/492-1530-ND/1790222
It transmits the color and intensity remarkably well.
Edit: Photo of lightpipe
You can also check out this post for detailed discussion for using an external status led: Bring Out Photon Buttons?