I just can,
nothing stops me from adding this functionality in old client, or any other,
what proofs/Portfolio do u need ? Last thing i was making ( couple of months ago ) was https://www.youtube.com/watch?v=5kKqIAFCWBI , Native Drawing of Texture(any/static/dynamic) for every Monster, Or Character, anything . Nothing special but yet, not many can do it without reversing client , coding, testing / repeat til working.
Also i have made UnrealScripts And XMLUI Compiler.exe , for latest Chronicles https://www.youtube.com/watch?v=Zdi2kSJJEIU ,
Also i have made UnrealEditor support Lineage 2 like 2 years ago ( no screenshots left) , way before the free version of gatsu , was released .
Also i have private Plugins that i writed For IDA, that helped me to reveser Lineage 2 Server.exe for 30%, till the state when i released that without good finanicing ( on promo, datapack,client workers) , the idea that i had wouldn't work .
Also i have some private work, that customer don't want to be noticed or i just left it unnoticed .
summing it up, I just CAN, even add discord to lineage 2, but at what cost ) ? it all depends on the time = $ , if its fit then i'm on it, if its not , i still have to offer, why not.