CA Gel will work for ferrules, but 1. has to be gel 2. epoxy is still better. How thick was the clear gorilla glue?
If I'm not mistaken that is still a cyanoacrylate (CA). It needs to be gel mostly for the gap fill. Also, will need to sit sometimes for over an hour to cure.
There was once a poster here, I forgot who, whose signature line was "I build cues because I hate money". I don't know why but this post reminded me of him. A testament to the determination and patience it takes, I guess.
You are correct, it has not been produced for years. I was told that it was inconsistent, blotchy, unsellable and the manufacturer won't take returns.
They have something sort of close now but it will not match old construction.