dynamically switching $editor [keybinding question]

["Wilkinson, Alex" <alex.wilkinson@xxxxxxxxxxxxxxxxxxx>]

Hi all,

Can someone tell me if it is possible to set a keybinding to
dynamically switch between different $editors on the fly ?

e.g. I want to be able to set a keybinding that will switch between
     the following 2 $editor:

     set editor="vim -c 'set filetype=mail' -c 'set textwidth=70' +:$ +:star!"
     set editor="vim"

Is this possible ?

Cheers

 - aW