Yeah, this is the solution I was going to recommend, but you got to it first. :)

The perlmod page clearly says that the first END that perl encounters is the last one that gets run, so maybe something like this would work for you:

# very very top of your first file
END {
    if (@::final_exec) {
        exec {$::final_exec[0]} @::final_exec;
    }
}


# later that same day...
@::final_exec = ($^X, 'scriptname.pl', @args);
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