I will make something up for myself and get back in touch as if I can do it the way I think I will be able to, which I assume I will be able to do, we could check the ID's of skins from the list I generate with the skins from
here as I believe it is updated every wipe when new skins are added, that would get rid of any authorised skins from the list as well as making a way for additional skins to be added relatively easily by people when it is updated.
The only drawback of this mod is how long it takes to add skins, a populated list from anywhere would make it a lot nicer/easier to set up.
On the forum getting chunked up with lists you woulnd't need to host the data here bar a single post which would be "Big ol' list of skins" in the subject line and a link to a Google Sheets or Drive folder with a document with a list of commands to run/the JSON file to import, this could also include a list of commands to remove any of the existing skins to double down on making sure there aren't any authorised skins in the list.
Also, I will be running this up for myself as I am learning Python and want to put it to use, I am not trying to step on anyones toes here.