AHC: Switch the fates of the Sorbs and the Czechs

Challenge: Have the Sorbs become large enough so that they get their own country, and have the Czechs just be a very small minority in Germany.
 
Challenge: Have the Sorbs become large enough so that they get their own country, and have the Czechs just be a very small minority in Germany.

The first part is quite doable (one would wonder why it wasn't done IOTL after 1945, Stalin should have love the idea).
The second requires a weaker Czech cultural tradition. Eliminating Hussitism might help.
For a later POD, have the Bohemian phase of the Thirty Years Wars be longer and more-fought, and Bohemia in general be more of a battlefield during the whole conflict. That would both ravage the population severely (with repopulation done by people that would assimilate to German identity) and likely foster a more thorough Hapsburg policy of "Germanization", or, better said, of deculturation against Czechhood (see as tantamount to subversive Protestantism).
 
Have Boleslaw Chrobry and his son, Mieszko start to eliminate the Premyslids on the male line and annex Lusatia and have Bohemia later inherited by a German noblehouse.
 
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