Here is the general idea, PouletsDeCajun.
RIW = Prolific egg layer all year round. Brown eggs.
EE = Good egg layer, but doesn't necessarily lay during the winter months, and not nearly as many eggs as the Rhode Islands. Blue, Green, Blue/Green eggs.
RIW x EE = Prolific egg layer that lays all year round, including winter. Egg colors most likely to get: Green with undertones of brown, possibly blue with undertones of brown.
Refine the hens that are laying the blue eggs with the brown undertones to try and improve the color to achieve more blue and less brown tinting.
Once this is achieved and I have multiple hens that prolifically lay nice blue eggs all year round, then I cross with the silkies to then add the unique feathering. Egg production will fall, because Silkies do not produce like Rhode Islands. But Rhode Islands produce better than Easter Eggers, so hopefully this makes the Silkie cross a better egg layer than what I would have gotten had I just crossed an Easter Egger with a Silkie.
Refine this breed until I can achieve a fluffy feathered bird that is a prolific blue egg layer all year round.
Does this plan seem formulated well enough for you?