If you can somehow avoid modifying a certain file (it's a pretty heavily modified file, so I guess that's unlikely), you could just not include that file in the www version and that would work. Or Patreon supporters could contact you with proof of support and you could send them the Patreon version of the file. I can tell you in private what to change in what file to unlock Patreon content, not gonna post it in public because piracy.