I was wondering who Frederick the Great could've married instead of his OTL wife. The common trope is that he wed Maria Theresia of Austria, but I wonder if this is as likely as everyone makes it out to be? Friedrich Wilhelm I was a staunch Calvinist, and although he apparently would've been willing to offer Wilhelmine (OTL margravine of Bayreuth) to the Habsburgs had an archduke been available, I can't see him signing on to the idea of his son and heir marrying a Catholic - likewise, Karl VI might be equally opposed to his godson (Friedrich) wedding his daughter on religious grounds. Sure, Fritz can convert everyone says, but if he didn't sleep with his OTL wife because he regarded her as an Austrian spy or that it was a constant reminder of Austria's attempt to pigeonhole Prussia, why would he have slept with Maria Theresia? Is he suddenly having a personality change? He can't stay heir to Prussia if he converts (Karl will insist on a renunciation as he did for François Étienne most likely) and he won't be allowed to marry Maria Theresia unless he converts.
So that's the common Friedrich-Maria Theresia idea out of the window.
I'm only aware of two other candidates that were ever considered for him, one of which I view as unlikely as Maria Theresa (Amalie/Amelia of Hannover and Elisabeth Katharina of Mecklenburg-Schwerin (Anna Leopoldovna). Anna Leopoldovna would likely also necessitate a conversion (or at least an agreement that their kids would be Orthodox) and possible renunciation, hence why I don't think it's likely. Hannover might be a good buy if we could just get Friedrich Wilhelm and his brother-in-law to agree for a hot minute so that the match could go through.
But are/were there any other ladies worthy of consideration?