You're in luck, as this feature already exists. You can disable your Wurst Client simply by going to Escape > Statistics, then click on "Disable Wurst". This hides all Wurst logos, ESPs, Wurst Options, etc.
There's even an option to hide the "Enable Wurst" button in the Statistics screen while Wurst is disabled, that way it's completely invisible. However, do remember that if you opt to hide this button, you won't be able to re-enable Wurst without restarting the game.
I hope this helps, and if you have any more suggestions or questions, feel free to let me know!