The 6u space bar also has odd spacing and does not fit boards like the Infinity either. It seems derived from Cherry's 6u space bars with an offset middle stem. Both the stab stems and switch stem do not align at all with the Infinity's layout. I can't speak for the Korean boards that allow a 6u layout, but it's so uncommon in general, that I don't think many will bat an eye at a 6u space bar being mostly incompatible.