In a very technical sense, maybe Hanover can pull this off if British Queen Victoria is a boy (and has no hemophilia gene).
The mutation happened with Victoria (either in her mother's egg or father's sperm). There is no evidence of hemophilia among her maternal relatives, including her older half-brother and half-sister, and of course Edward of Kent didn't have it.
After all, this would mean that the union of the British and Hanoverian Crowns doesn't end in 1837--which in turn might mean that "King Victor" might be considered to be a good compromise candidate by the Frankfurt Parliament to lead a united Germany in 1848-1849 after the King of Prussia refuses to accept a "crown from the gutter."
But absolutely no one in Britain will support any such entanglement for the British monarchy. Even if Victor thinks it's cool, everyone else will say "No!"
Now if Victor has a younger brother, it's possible that at William IV's death, Hanover would be spun off to him, and by 1848 he could be the favorite of German liberals.