Hey there 
I’m from the unofficial RP community and I thought id just list a few ideas.
I’m not a coder or dev so I’m not sure how to go about it, but my idea was this.
you use that anti-cheat thing for official play, so how about another background problem that is hard-wired in the Conan install files that acts as a localized ID that the program searches for when a player logs in.
something that can not be bypassed via alt steam accounts as it’s in the game file and linked to their product code.
- most of us RP servers have a whitelist system, perhaps you could do something like this, where players need to log into a Funcom website and enter their product id as well as other alt steam accounts numbers which are entered into a Funcom database the game can check against upon log in?.
- implement an alt character system like this amazing mod: TERPO-Reborn 1.4.4