Accessibility Modes

Hello,

I am part of the team responsible for the website for Andrews University (
www.andrews.edu) and we are currently working on figuring out how to best
meet the WCAG 2.1 AA level of standards.  Some of the colors that we are
currently using on our website are not compliant with the contrast
requirements, however they are an integral part of our brand identity as an
organization.  We are wondering if we could create a button, perhaps on the
top navigation bar, that can toggle a high contrast mode for our site.
Would this be acceptable as part of the WCAG regulations?

Thank you,
Sam Clough