I think yes, it's fine. I'm more interested to who the Duke of York would remarry if he is not a heir presumptive when his first wife dies. Mary of Modena only agreed to marry him when he was heir presumptive seeing that it was her chance to "bring England back into fold". When York has less chances to inherit England, she'll likely reject him in favor of her dream of being a nun.
In A&D Duke of York remarried to the last Tyrol Habsburg princess, Claudia Felicitas Habsburg, the match being possible by having first wife of Leopold I live a bit longer. There the match is still possible (Mary of Modena balks at marrying "just King's brother and not potential heir" and Claudia being OTL alternate candidate), and Mary & Dauphin will pretty much be a counter-reaction to the Austrian match for Duke of York.
With second and third in line marrying/being Catholics by 1680, Charles II has nothing to do but ensure his heir is married to a Protestant bride, and Sophie Charlotte, niece of popular Duke of Cumberland, seems just the right Queen material, being quarter-Stuart herself. The new Princess of Wales arrives to Britain in 1685, short before her father-in-law death (happens a bit later TTL due to his lifestyle being a bit different due to having a legitimate son, so let's say TTL Charles II dies in December 1685). She is accompanied by her elder brother, Prince Maximillian Wilhelm of Brunswick, who was disinherited after Hannover adopted the primogeniture, and tried to test his luck in his sister's new Kingdom (OTL after being disinherited Prince Maximilian became a mercenary in Morea, in A&D we planned for him to go to Britain pretty much for the same reason of being disinherited in Hannover). The young man made a good impression on Charles II and was given the title of Duke of Cumberland previously belonging to his late uncle, as well as eventually married Henriette of York, the youngest of the Duke of York's daughters from his first marriage to Anne Hyde.
In A&D Duke of York remarried to the last Tyrol Habsburg princess, Claudia Felicitas Habsburg, the match being possible by having first wife of Leopold I live a bit longer. There the match is still possible (Mary of Modena balks at marrying "just King's brother and not potential heir" and Claudia being OTL alternate candidate), and Mary & Dauphin will pretty much be a counter-reaction to the Austrian match for Duke of York.
With second and third in line marrying/being Catholics by 1680, Charles II has nothing to do but ensure his heir is married to a Protestant bride, and Sophie Charlotte, niece of popular Duke of Cumberland, seems just the right Queen material, being quarter-Stuart herself. The new Princess of Wales arrives to Britain in 1685, short before her father-in-law death (happens a bit later TTL due to his lifestyle being a bit different due to having a legitimate son, so let's say TTL Charles II dies in December 1685). She is accompanied by her elder brother, Prince Maximillian Wilhelm of Brunswick, who was disinherited after Hannover adopted the primogeniture, and tried to test his luck in his sister's new Kingdom (OTL after being disinherited Prince Maximilian became a mercenary in Morea, in A&D we planned for him to go to Britain pretty much for the same reason of being disinherited in Hannover). The young man made a good impression on Charles II and was given the title of Duke of Cumberland previously belonging to his late uncle, as well as eventually married Henriette of York, the youngest of the Duke of York's daughters from his first marriage to Anne Hyde.