That could be the way to go.If i ever decided to sell chicks or hatching eggs it would be down the line a bit. I just would want them to be actual olive eggers. Otherwise id have to call them easter eggers?
If it was me I'd call them olive egger "project" birds and just be honest. Explain that you're working towards true dark olive color eggs but you're still in early stage so you haven't had offspring to laying egg yet to determine just how dark your birds are producing.
Like I said lots are just producing green eggers and lots are happy buying them as olive eggers.
You have to start somewhere with projects and being honest with where you're at should go a long ways with buyers.