So this means nether portal raiding is no longer possible? Seeing as it’s against the rules, this sounds like a fantastically simple solution! What happens when you create a new portal in the overworld which is near an already opened nether portal? Does it connect without a problem? Is it only when you try and generated a new portal (whose second opening will be located in a claim) that the permission feature prevents it from being created?
I don’t think its that sophisticated, I think its as basic as not being able to activate, like use a flint and steel on the portal if its not activated unless you have trust.
I did request checking for trust in a claim before auto creating a portal to the developer, and he said he didn’t want to add it.