yeah spoons are way better than forks!

there is no official perchance plugin to prevent forking because perchance encourages sharing and duplicating.

Those that make their own way, i believe, basically add a little code to check what the url of the page is and, if it isn't the specified url it wrecks the loading of the generator. They often try to hide the code via labeling it deceptively so people cant just find it easily and remove it. I personally don't prevent forking on mine. really if someone forked mine and actually pursued it as much as i do myself i would be impressed. My suggestion is ask on generators that prevent forking and, since you aren't trying to duplicate their gen, i'd think they would help you set it up for yours.