@AlternDrak You don't need to inject to load a script into Plutonium. I recommend reading through this guide: https://plutonium.pw/docs/modding/loading-mods/#loading-existing-scripts-on-t6
If its a _clientids.gsc it should work with the above guide, but if not you can try putting it in storage\t6\maps\mp\gametypes_zm for ZM or storage\t6\maps\mp\gametypes for MP. If you don't have any of the folders just create them.