I would run slightly warm water over it until the membrane softened enough to come off. If needed I'd add a drop or two of Dawn. I would do whatever it took me to free the chick, whether it involved a few careful snips with scissors or a bath and gentle scrub with a toothbrush, etc. After the wetting I would gently towel it off a bit and put it back into the incubator to dry. TBH, I don't know if this is right, but doing nothing isn't working well at all, so unless something better comes along, this is what *I* would do. You think it over and, absent better ideas from elsewhere, figure out how to at least try and help your little guy.