It's pretty much recommended for new players to give that land away anyway. It takes a lot of skill and luck to beat France in an early war vs France and most guides just recommend giving that land up either in a war or diplomatically.
As long as the player keeps up with their navy and makes sure to have a larger one than France at all times, then there's not really much France can do against them. Even if England goes and starts working on Scandinavia. Which is a fairly typical move for a human England that's been kicked off the mainland.