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You just described a jackshaft. It is normally used on mini bikes to multiply gear ratios, but it's also used to transfer the drive from the left side of an engine to the right side of the wheel.
In the case of the BW200, the primary chain connects the countershaft sprocket to the jackshaft, and the secondary chain connects the jackshaft to the rear sprocket. You can correct virtually any misalignment this way.
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Weldangrind
"I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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