“3) Show fake stuff and delete real stuff”
The problem here is that it’s very complicated to fully erase data from a hard drive so that it cant be reconstructed. Even writing over it does not do the job, as per the DOD.
A better answer would be to simply keep sensitive data on a thumb drive. You can over write that, or you can simply physically destroy it.
Actually it is possible. You just have to write over the data several times. I’ve seen the technique used to get the old data under it and severas writes (It used to be like 7) and no way you’re getting the data back.
Also keep in mind the data is encrypted! So they’d first have to recover what was there...then decrypt it! Good luck with that.