If you aren't in a rush, you could wait until you get a broody and then find fertile eggs. Sounds like you already know some sources. If all goes well you could have a couple options of cockerels to choose from. You'd have a better chance of getting to know the them since you'd have a longer observation period. Plus I think cockerels raised by broodies and among mature hens are more likely to have good manners. The saying "hen pecked" was started for a reason.