I say put a cuckoo marans roo over some EEs hens.
This should give you at least 50% blue egg base on your pullets with lots of brown pigment to bring out the olive. (and some lovely cuckoo coloring too)
Oddly enough, I have those makings purely by accident. Earlier this year I bought 8 EE pullets, and 5 straight run Cuckoo Marans. Looks like all 8 EEs are indeed pullets, and I got 4 of the 5 marans are Roos. I was planning to get rid of the roos, But I might keep one (or two). From this cross, all green/blue eggs in the nests will be future olive eggers (well, the pullets anyway) and they will be nifty barred ones at that.
Here they are (only about 8 weeks old)
More photos on my web page below.
So, continuing this line, If I get this F1 flock of Barred Olive Egger (EEs), and then cross them on a (blue) splash EE roo, I'd get sex linked EE chicks; Blue Cuckoo cockerels, and Blue pullets, Right?