Switching icon sets when switching between dark and light theme

When switching between dark and light theme I have to manually change the icon set also, because the icons I use for the dark theme is too bright to be used in a light theme.

Is there any way around this tedious process?

I read this post, but I didn't really understand how to go about it.

The linked post is the way to do it, by having alternative light/dark icons in the same icon set.