P.S.

teach them c# and I guarantee they will be making executables to cause trouble

No, you're overestimating the students ability. I taught C# in coding club (they were mostly around Year 8), and it was a struggle just getting them to understand basic programming concepts (imagine having to explain MVVM to them - they're not good at understanding abstraction) - they wouldn't have had a clue how to turn it into a malicious exe.