How about adding use MyModuleWhichExports_die; where MyModuleWhichExports_die exports a custom sub die { } which does whatever you need it to do?

Thanks for that. I did not realize you could overwrite Perl's built-in functions that way. This is pretty much what I am looking for.

Quick (possibly dumb)question:
Is it possible to inline MyModuleWhichExports_die in the main program and have it "export" the custom die() function?
e.g.:

package MyModuleWhichExports_die;
# Something like Export's "@EXPORT" list here
sub die {
    CORE::die "New and improved!: @_";
}

package main;
die "I want to be prefixed with 'New and improved'";
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I know I can do that by using the fully qualified name of my custom die() (MyModuleWhichExports_die::die), but that defeats the whole purpose of writing a wrapper so I don't have to change my original die() calls in the code