Not saying it'll always work but I think early exposure & integration can really help with getting chickens to accept different-looking breeds. Crests aren't even really noticeable on chicks until they're feathered - other than maybe a bit of extra fluff, or sometimes a vaulted skull - so they're already accepted as a part of the group before they start looking different. Once there are older chickens who are already used to crested birds, introducing more is less of an issue even if they're already fully feathered.