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Is the roo a true Ameraucana? If so, you could cross him to Barred Rock hens and get sexlinked Easter Eggers as offspring. The male chicks would all be barred. The female chicks would all be black.
The sexlink trait will only be in the first cross though. If you later cross any of the chicks, or breed back to the parent birds, then you won't get sexlinks. But then, this is true of all sexlink crosses.
The offspring would all be EEs and most females will lay a greenish egg - maybe sort of olive colored if the original Barred Rock hens lay darker brown eggs.
To get a sexlink cross using an RIR, you need a RIR Roo and then cross to hens in specific other breeds.