Bit of a darker-toned solution here...
The Nazi's win WW2 decisively, and proceed to pursue their Lebensraum through ethnic cleansing of Slavic peoples including Czechs. My recollection of these plans is that the Nazi's planned to assimilate a certain percentage of various Slavic groups, but felt that the remainder would have to be "removed".
Now they could just go with the good ol' concentration camp solution there, but Slavs are a whole lot more numerous then Jews and Gypsies are/were, and the Germans have greater sympathy for them. So instead they start a program of relocation into Siberia/Central Asia, with each ethnic group getting it's own sector/s.
So there you have it: majority Czech country/ies in Asia. Won't be much more then Bantustans initially, but the Germans probably loosen their grip as time passes. Or maybe not, they could just as easily spiral deeper and deeper until they're at North Korean levels of Dystopian autocracy. Either way that sort of meets the terms of your challenge I think?
If anyones offended by this for any reason, I apologize in advance.