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How plausible does the idea of a Hanover-Hohenzollern ruler of Great Britain, Hanover and Prussia sound:

Point of Difference: Crown Prince Frederick William of Prussia, dies in December 1812 while still only heir apparent to his father, Frederick I of Prussia.
Leaving behind, his wife, Sophia Dorothea of Hanover, one daughter, Princes Friedrike Wilhelmine of Prussia, aged 4 years old, and one son, Prince Frederick of Prussia, who at only a year and 11 months became Crown Prince to his grandfather.

As Regent to her son, who became King Frederick II on the death of his paternal grandfather, Frederick I, on 25 February 1713 aged, 2 years, 1 month and a day old, Sophia Dorothea was able to arrange the marriages of her children to their English cousins, with King Frederick marry Princess Amelia of Great Britain and Princess Wilhelmine marry Frederick, Prince of Wales.

When news reached Prussia, that Prince George of Wales, was not keen on the proposal of his son and heir, Sophia Dorothea and her daughter, travelled quickly to Hanover, where on March 1727, she was able to have Frederick marry Wilhelmine.
A year later, the royal couple and their first child, Prince William, arrived in England in 1728, the year after his father had become King George II.

On 12 June 1733, twenty-two year old, Princess Amelia of Great Britain, who had travelled with her father, King George II to visit his holdings in Hanover, was married to King Frederick II of Prussia.

Because like in OTL Frederick II died childless, he was succeeded by his nephew, King William IV.
Who became King William IV of Great Britain, King William I of Prussia, Prince-Elector of the Holy Roman Empire, Duke of Brunswick-Luneburg.

How does the rest of Europe react to Britain now holding two states that can vote for the Holy Roman Emperor (Elector of Brandenburg and Elector of Hanover)
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