So would he have hauled Frederick of York and Albany over to Hanover to act as Regent?
Would we perhaps see an Act of Security being passed - to separate the crowns of Hanover and Britain, so the Hanoverian crown would pass to Frederick in 1820, then onto William IV in 1827 for ten years until 1837 upon which Ernest Augustus becomes King as in real life.
The British crown then diverts from George IV directly to his eight year old niece under the Regency of her mother and Sir John Conroy and they exert more control than in real life - perhaps she dies in 1835 whilst suffering from pneumonia in Ramsgate following the additional pressure from the Duchess and Sir John.
Subsequently the crown of Britain settles upon the Duke of Sussex for eight years, then to the Duke of Cambridge and his son until 1904, then Princess Augusta to 1916 and her grandchildren Adolphus to 1918 and Marie to 1948 and then onto Prince Ernst of Lippe to 1990 ...