I think you have the right idea about listing them as blue egg layers. If you are doing a free listing (such as Craigslist) I would have 2 listings, one for Cream Legbars and one for blue egg layers. If you post a link to somewhere that sells the chicks for more, it might help. If you haven't already, make sure to include photos of the eggs, not just the chicks or older chickens.I have them priced at $25. Thought that was pretty reasonable.
My husband keeps telling me to calm down, they'll sell eventually. We do have the room, just in case.
Most people are going to think $25 for a chick is to much when more than likely they can purchase a pullet closer to laying (in most areas) for that or a little more. They are looking for eggs, not the breed. $25 sounds more than reasonable to me. Our extra EE's have sold like crazy here because everyone wants the colored eggs and I had them off of heat before selling them, I sold them for $10/each at 4-5 wks. I probably should have asked more.
Good luck! If I lived closer I would take a few off of your hands!