Challenge : Prussian Bohemia

Your challenge, should you accept it, is by any PoD between the rise of Brandenburg-Prussia personal union and 1800, make Bohemia end up being part of Prussian empire and have it land-connected to Brandenburg by the time of its acquisition, by 1790s at the latest. Your conditions are :
- It must not be land-connected to Brandenburg through Saxony ! (at first at least)
- If this Prussia will ever going to acquire Saxony, Bohemia must be acquired first with interval between acquisitions being 60 years or longer, the longer the better.
- Even if Saxony will be annexed, the Saxonians will have to remain as their own socio-cultural community instead being assimilated into Prussian culture at the very least.
 
1742: Silesia conquered by the Prussians
1745: Prussian-Ottoman Alliance.
1745-1758: Austrian war. Prussians capture Bohemia in 1751, Ottomans gain the Banat, Serbia and Transylvania.
1772, 1795: Prussia gains the OTL Austrian parts of Poland in the partition.
1760-1795: Austria regains territories lost to the Ottomans, extends influence over Bosnia.
1815: Saxony becomes a fully autonomous region within the Prussian Empire at the Congress of Vienna.
 
If Europa Univeralis EEP/AGC mod it to be trused, during the Hussite War the Brandenburg Margrave was offered the throne of Bohiemia by the Pope. Have him actually manage to conquer it, and voila.
 
If Europa Univeralis EEP/AGC mod it to be trused, during the Hussite War the Brandenburg Margrave was offered the throne of Bohiemia by the Pope. Have him actually manage to conquer it, and voila.

The problem with that idea is that, in that era, Bohemia was by far the stronger power. What you'd have instead is a Brandenburg controlled by Bohemia, effectively, just like few people would describe the Hanoverian UK
as the UK controlled by Hanover. With Bohemia the bigger prize, the new kings would swiftly become Bohemian and view Brandenburg as the territory.
 
Although that I recognize it is unlikely, was there any chance for Frederick V of Palatinate remain as the Protestant King of Bohemia after his election in 1619? Because in this case we could have after some time a union of Prussia and Bohemia through marriage between the Royal House of Bohemia and the Hohenzollerns.
 
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