2,3 and 4 are ok; but 1 is too much: afaik Sauros never got there, there was a scythian "invasion" that reached Germania in 5th or 4th century BC (iirc), otherwise the contact with the Sauromatae was the other way around (germanic tribes reaching Crimea) and it was in AD times...
I think what could be done is importing either steppe units to the KH or hellenic to the Sauromatae, creating the Kimmerios Bosporos roster, which would work like the roman eras: ie can't use both units in the same army...
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