Maybe it's because I only ever saw the "Final Cut" and all, but I definitely felt for the replicants long before that. Even in the scene with Roy and Leon in the freezer with that Asian scientist, Roy is menacing yet not evil, and in a way almost childlike - he really seems precisely like what they say he is, a creature created as a powerful adult man who has to start from zero in experiencing emotions. Same with Pris and to a certain extent even Leon - Zhora doesn't really get enough screentime to show much development, and Rachael doesn't even realize she's a replicant, so obviously she seems much more human.

Fairly sure the answer is no - after all, that's in the very same street where that Egyptian guy makes his artificial snakes. The ones sold in the streets are bound to be artificial as well.