Or maybe with the Cemanis you could raise them to adults and then sell them as a breeding trio? But in that case you would have put more money into them already... @MysteryChicken , what do you think?
If I had them, being rare and expensive in a lot of cases seemingly, I'd probably keep them at least for a while. If the rooster got nasty, I may try to sell him. It's totally up to you. I'm not sure what your chicken budget is and if you don't want to pay for a breed that you're not in love...