Colorfriendly Rainbow?

As a cover for my picture book about colorblindness I want to use a rainbow as the eyecatcher.
Do you guys think this would be a good idea for the cover or should I go for something else?
I know it's impossible to make one that's visible for everyone but I'd like to try and make it as colorblind friendly as possible?

Anyone have good advice for this? I was thinking of using different patterns in each color?

Let me know what you think