I haven’t tried the above layout, but off the top of my hat, I made this quick example here: https://www.mediafire.com/file/pza9khnsqy7ks1w/Mouse_Toggle.mgc/file
Basically, it’s two Deadly Strike widgets at the exact same position, each with Mouse Navigation and 2x Ghostly Presence. They’re configured so they turn on absolute/relative mouse mode, hide themselves, and make the opposite widget appear.