Prussian were allies of the Dutch, with
Frederick William inviting Huguenot refugees to settle in Brandenburg and replacing his French alliance for one with the Dutch, who now joined the anti-French
League of Augsburg.
The Huguenot refugees in England were what caused the panic against James II to start with IIRC, carrying their tales of the dragonnades in France at the time of the Revocation of the Edict of Nantes. Not only that, but
England will be the deciding factor in the match,
not the Netherlands. Prussia in 1700 has very little to offer England.
This is why I went against a French match, plus the fact that a catholic wife may be seen as a new avenue for the future heirs to be catholic as well stated in the Succession Act of 1701.
Pretty sure the Succession Act or the Act of Settlement will
not look exactly the same as they did OTL. William III met with Sophie of the Palatinate, her son (George I), her daughter (Sophie Charlotte, queen of Prussia) and Sophie Charlotte's son, Friedrich Wilhelm I, three times to discuss the succession prior to passing that 1701 act. Sophie had demured at the first meeting and made the suggestion that William III adopt James Francis Edward Stuart. William extended that offer
twice IIRC, once just after Mary II died and once just before James II died. Highly unlikely that he would've done so if he had
any intention of allowing the 1701 Act to pass at the time.
When he met Sophie, Sophie Charlotte and her son the second time at Het Loo (before the second offer of adoption), he
again spoke to them at length about it. Sophie recommended that perhaps JFES had learned from his exile (like Charles II had), but James II refused to allow the adoption. Out of frustration, William told the electress of Hannover that if she
wouldn't accept, he would name Friedrich Wilhelm of Prussia heir to all three states (the Netherlands, England and Prussia). Gottfried von Leibniz (Sophie's librarian) records the panic that this caused at the Hannoverian court. Not only that, but the Countess of Wilhelmsburg (George I's mother-in-law) was negotiating with William III to recognize George I as (eventual) heir, since she hoped thereby to better the situation of her daughter (then imprisoned at Ahlden).
So,
with a son and
no offer to the Electress of Hannover,
no refused adoption yada-yada I don't see William III's TTL Succession Act looking
anything like the OTL one.
In her bio it says “Élisabeth's mother initially wanted her daughter to marry King
William III of England, who was the widower of Queen
Mary II of England, but, due to William being a Protestant, the marriage did not materialise.”
I understand it differently. If William was
so Protestant that he wouldn't marry Mademoiselle de Chartres, why did he not marry anyone else either? There certainly wasn't a shortage of other Protestant princesses around. But instead, when Mary II died, William not only refused to remarry but he gave his mistress, Elizabeth Villiers, her congé as well. Now, obviously the duchesse d'Orléans writes of a menage à trois between William III-Keppel and Bentinck. But she writes the
same of Anne-Sarah Churchill and Elizabeth Percy/Abigail Masham, and calls the late Mary as nothing more than a coquette and alleges lesbianism between Mary and a lady at the Dutch court so I think we can dismiss it as scurrilous gossip and the ravings of a mother pissed off at the loss of a splendid match for her daughter.