first, i want to apply the same disclaimer that CageStooge wrote:
First, don't want to be pushy here, I'm just tossing out ideas for you.
second, i have to agree to him on a second statement too:
I have to keep marking the words to get enough contrast to be able to read here ...
and it's even worse when quoting other people
why didn't the portal programmers see that themselves ?
third and finally, my real post:
three months ago, another mod was published to change the colors of circuit wires for colorblind people. it also would have helped me (non colorblind) to see the dark green wires better while setting up some logistics, or to make red wires less visible when a setup has been completed, but it doesn't allow the color of wires to be changed neither separately nor with some mod settings, but only enable the mod to replace red AND green by blue AND yellow. here is my suggestion on that mod's page: https://mods.factorio.com/mod/ColorblindCircuitNetwork/discussion/5a8ed2433c712c000b707ca6
maybe you could add some such selection of colors for all three kinds of wires, having three per-player mod options with a drop-down: copper / invisible / red / green / blue / yellow / <maybe more>
and there is also yet another mod https://mods.factorio.com/mod/ConnectionBox that allows to place special "logic poles" which remove the copper wires after placement, but have them visible during placement. i don't know whether something like that would be helpful for your mod since there still is only one color of copper wires and changing that after placement probably would require another type of wires which has to be implemented in the core of factorio and not in a mod.