a) I've never seen a script that does this.
b) I've never heard of a script do this.
c) I don't think scripts should do this.
d) Scripts that force people to join channels are annoying.
e) Scripts that hide the fact they are doing this are annoying and sly/malicious.
Could you describe exactly why you're wanting to do this?
I don't know of any way to join a channel without at least seeing a flicker. It certainly couldn't be hidden from the person if they /whois themselves. Connecting to a "hidden" IRC server sounds even worse to be honest.
Don't want to sound too accusative, but I'm sure you can see how it looks a little odd when someone wants to make a script that connects to a hidden IRC Server and join a hidden IRC channel without anyone knowing about it!