Multi String with fixed color

I have wled with multiple strings attached at different GPIOs. I have the first string setup to be an effect. Doesn’t really matter but something that has multiple colors. I want to create something that will auto set the other strings to be some color from the first effect on string 1. Example

String1.getPrimaryColor() and set String1.setColor()

So whenever the effect or primary color changes I have a routine that picks a color from a pixel in string 1 and set string 2 (all pixels) to that single color.

Kinda like the mirror option but not a 1:1 match. a single color from string 1 on all of string 2.