You are right in with that - Andalusians are the hardest breed to keep, between the blacks and splashes and "we don't sit on eggs" - no wonder they are endangered. But still love them - blueandalusian.com
Mine sit. I had one lone female several years back who went broody for me. She had a daughter who did as well, and so did the daughter... on down through the years. Every year so far, I've had at least one go broody. In my bantam project I have several!