No, the only way to destroy the flash control once created on that screen is to use the "/DISCARDABLE" skin option. G has talked about this before in a few diff places.
Or to load the flash control with a dummy swf file. Ie... just an empty movie, which would take up less mem and cpu as its not really gonna be doing anything.
One last way would be to use a var as the movie file name and set the var to nothing, do a reloadscreen, before exiting, that might work if you want to save the screen in mem...IDK?