I've only had two Orpingtons, both buffs. One was frequently broody, the other never was.
Just because a breed is supposed to be prone to set, doesn't mean that one will. Leghorns are not supposed to be broody. I had a black leghorn that raised 2 clutches a year for me and when we had 100 white...
No problem. The advantage of a mother hen is that they take all the guesswork out of it and normally have high success rates. The advantage of an incubator is that you hatch on your schedule and not when the hen's hormones cause her to want to raise a family.
You can increase your odds with a...