Thanks for the reassurance. Until I read the first post, it had never occurred to me that a CW rig might accept only one or the other type of key. Perish the thought of having to throw away the key you've used for forty years and learn how to use something else!
When I operated mobile CW, I used my trusty J-37 (as seen at www.QSL.net/KC5JK
) which I mounted on a heavy steel base. Oddly, that key originally came with a leg mount, making it the single most suitable key ever built for field and mobile work, but I had long since let go of the mount, to someone who wanted it much worse than I.