It would be a very hard secret to keep. I know the Allagans were into some biological fiddling, but I don't know if ultra-realistic robots were on the agenda, especially considering their technology has a very distinct look.
I don't even know if the other races were known to them, and if they were, if they would make constructs in their image. I doubt they would be realistic enough to hide.
Though, I've already stated my position on that possibility, so I suppose I'm out of things to say on that. I still think you'd be much better off just finding a new way to integrate their story into a new setting, instead of trying to preserve what's there but might not be compatible.
I don't even know if the other races were known to them, and if they were, if they would make constructs in their image. I doubt they would be realistic enough to hide.
Though, I've already stated my position on that possibility, so I suppose I'm out of things to say on that. I still think you'd be much better off just finding a new way to integrate their story into a new setting, instead of trying to preserve what's there but might not be compatible.