Let's assume that by whatever odd mix of dynastic events, 18th century Prussia and Hanover get merged in one state, but the personal union of Britain and Hanover is averted.
Let's also assume that if the scenario is feasible at all, OTL Prussian annexations of Silesia, Pomerania, and western Poland are somehow not butterflied away.
Which sequence of dynastic PoDs would make this possible, and how would this influence the course of 18th and 19th century events (apart from the caveat above) ?
I do not propose a detailed poD because, well, dynastic issues befuddle me. But my reading of threads concerning the Anglo-Prussian Union PoD made me vaguely aware that right sequence of dynastic events might make this double PoD possible.