I want to disable Alt-F11 to someone reach to Macro settings. If I coopt another combination then I can reach to it with another short-cut that I only know, instead of Alt-F11.
You are trying to apply levels of security that Excel was never designed to have.
If you do not trust the users then you are in trouble, anyone with a basic knowledge of Excel and the internet can crack any Excel security.
You are spending a lot of time trying to reinvent some thing that was never invented.