The problem with using a William and Mary POD should be quite obvious: the Stadtholdership wasn't hereditary. The various provinces of the Netherlands were under no obligation to elect William's ATL son as Stadtholder and in reality would be very much against it. Everyone's forgetting the deep commercial and naval rivalry that existed between England and the Netherlands in the 1600s.
The Dutch lost more commercially and economically (the bank of England becoming more dominant at the expense of Amsterdam's financial institutions) then they gained under William's duel reign so no realistic chance of a continuing union. The Dutch would either elect a second son as Stadtholder or go through another Stadtholderless period.
Me personally I think the best opportunity for a union would be Philip II of Spain and Mary I of England. The marriage contract stated that a son would inherit both England and the Netherlands (in this case the whole Low countries), so make Mary never have cancer and there you go. She'd probably have a kid and live long enough (her mother's family was fairly long-lived) to cement Catholicism in England. With England as a base and the naval route clear Spain should be able to successfully repress the Dutch rebellion.
The other POD mentioned, a marriage between the future William II of the Netherlands and Princess Charlotte Augusta of Wales, is impossible. The marriage contract specifically stated that Britain would go to the couple's oldest son, while the second son would inherit the Netherlands; if there was only one son, the Netherlands would pass to the German branch of the House of Orange. Really in my opinion the Mary/Philip POD is the best possible one.
The Dutch lost more commercially and economically (the bank of England becoming more dominant at the expense of Amsterdam's financial institutions) then they gained under William's duel reign so no realistic chance of a continuing union. The Dutch would either elect a second son as Stadtholder or go through another Stadtholderless period.
Me personally I think the best opportunity for a union would be Philip II of Spain and Mary I of England. The marriage contract stated that a son would inherit both England and the Netherlands (in this case the whole Low countries), so make Mary never have cancer and there you go. She'd probably have a kid and live long enough (her mother's family was fairly long-lived) to cement Catholicism in England. With England as a base and the naval route clear Spain should be able to successfully repress the Dutch rebellion.
The other POD mentioned, a marriage between the future William II of the Netherlands and Princess Charlotte Augusta of Wales, is impossible. The marriage contract specifically stated that Britain would go to the couple's oldest son, while the second son would inherit the Netherlands; if there was only one son, the Netherlands would pass to the German branch of the House of Orange. Really in my opinion the Mary/Philip POD is the best possible one.