He just needs to return to France. At this point he might as well be a foreigner and anyway Edward IV has what, TEN children, some of them healthy boys and daughters engaged to some of the most powerful men on the continent while Westminster just has a daughter….engaged to the dauphin. Considering the anti French sentiment people are feeling at the moment he would look like a French puppet. I don’t think he will have a lot of people flocking to his banner. Not now. That time has passed, but he has a chance to live his life with his family in peace. You don’t want to miss with Edward when it comes to combat and his throne, he was pretty ruthless when he had to be. Just look at the OTL.