I tried to do something like this but didn't work.
What I did:
Used a program called "Sandboxie Control" - Basically lets you run things in a supposed enclosed environment on my HDD so nothing will actually be saved. I've played Rust with it just to get another account to mess with, including being trigger happy and unsafe.
It was like I was playing on another PC and I got a completely new account with the same name which I've managed to change later.
ps. Made this post partly to an update from this :P