Sure. But all Faverolles we have had are VERY docile and laid back. To the point they will just sit there and take bullying and not really move. So, watch for that. We’ve had Faverolles from 2 sources, and both sources had same personality. But, this also makes them gentle to hold and they generally don’t run from you.
it is very hard to introduce just one bird. They mayvery well get picked on a lot. So, if you can provide a long introduction with new one visible to the others, but they can’t attack -that would be great. Some people have additionally put a flock pullet/hen in with new one so they can bond for a couple of weeks before introducing new one into flock.
I have all three of those breeds together and I haven't had any problems. But mine were raised together. I agree with @Acre4Me that a long introduction is a very good idea
When I had production reds or red sexlink hens, they tended to be the bullies in the flock. Favorelles are sweet souls, and bringing one into that group may be difficult. More would be better, and then that very long introduction.
Mary