That's sort of crack at a "Rupertine Wittelsbachs on the English throne" challenge.
This guy:
http://en.wikipedia.org/wiki/Louis_Henry,_Count_Palatine_of_Simmern-Kaiserslautern
was a first cousin to Rupert and Charles-Louis of Palatinate, and held a von Simmern secundogeniture.
So WI he dies a bit earlier than in OTL, so on asking Rupert to marry and produce a spare legitimate heir for Palatinate in the beginning of 1670ies Charles-Louis may offer something Rupert lacks desperately - land AND proper princely title. Bonus points if Rupert upon accepting the offer marries a WIDOW of Louis Henry - Maria of Nassau, the youngest aunt of Willem III of Orange since it may create some MASSIVE butterflies for Third Anglo-Dutch War (even in case Rupert accepts title and marriage offer but stays at English court, despite being titular landholder in Germany).
In 1685 Palatinate is inherited by a son of Rupert and Maria (let's name him Frederick after both the Winter King and Maria's father), born in 1671 (or maybe married Rupert won't go to theatre in 1682 and won't get pneumonia, thus living five-six years more that he did OTL (longevity of his sisters Louise-Hollandine and Sophia is highly impossible with Rupert's wounds, but five or six years more than he lived OTL is reality).
I think that the Rupert of Rhine, Duke of Simmern-Kaiserslautern timeline was never tried here

So here's my attempt to collect feedback for trying one.