topbar link to change theme? for accessability

Hi guys,

I’m looking for a bit of help with a project I’m working on. Basically I have to provide a version of the site which is as accessible as possible. I have a theme in mind to use for this but i don’t want all users to be given this theme.

What I’m trying to do is put a link and a notice in the top bar allowing users to click this link to change from my current theme with bells and whistles to a different theme which is as accessible as I can make it.

Does anyone know of a way to change links via URL or a plugin that will allow me to put essentially a link in the topbar to change theme?

I don’t want to have this in every sidebar just a nice little link in the topbar to switch back and forth.

Any info is greatly appreciated so far i have found “theme switcher” but that seems to put a drop down box in the side bar which would take a screen reader too long to find. The top bar link would be found first I’m thinking thus making the whole thing easier.

Thank you.