Nah, man. As a modern (that means 17th c to present) British historian with a field in Tudor-Stuart, I assure you George III knew the things parliament would do if he performed the tyrannical things this ruling makes possible.
Parliament could get rid of him, and had experience doing so
😄
But even if they didn’t apply a “Charles I” solution, which gets messy, they could apply a William and Mary solution or George I solution (dredge up some distant cousin)