Toggle Between Fonts

Hi,

I've recently come across a font designed to help reduce the complications related to dyslexia called OpenDyslexic.  I don't find this font particularly appealing from a visual design perspective so I wouldn't want it to be the default font in the course.  However as someone with dyslexia, I find it extremely beneficial.

I'm curious if anyone has ideas for an easy way to implement some kind of "toggle" button that would change all on screen text between fonts.  Ideally, I would like to have an accessibility menu of sorts where this was an option that the learner could select if they are interested.

In theory, this menu could also eventually handle things like dark mode, contrast issues, etc.