I know this is an old post but I am dealing with the exact same thing... wondering what method you ended up using and how did it go? Any advice?It's definitely glued on. :-(
I could take the switch apart but I've done that before and it's a bear to put those back together. I did the last one (for a different machine) on the kitchen table where I could catch all the little springs and bearings, etc. Took me an hour or so but I cleaned it up and finally figured out how how to put it back together but then I just slid it onto the handlebar. reassembling it on the machine would be a nightmare.
Since I've already ordered a new switch I was hoping to just slide the new switch on without having to take it apart.
I will try the wd-40 approach.
Thanks for the suggestions.