I will throw mine in the ring as well. It features a slash command to toggle as well as a configurable hot key.
http://www.esoui.com/downloads/info3...metToggle.html
I will look into adding a helmet toggle button within the apparel window. I have yet to play with dds files or doing anything with windows so I won't give a timeline but I think the idea is cool and I want to see it added.