I believe that won't work, based on some tests. Localizing *STDOUT breaks the magic that ensures that ensures that the STDOUT handle always has fd 1, and the fd is the only thing that matters when spawning a child. Something similar that should work is:

{
    local *FOO;
    open FOO, ">&STDOUT";      # fileno(FOO) = dup(1)
    open STDOUT, ">/dev/null"; # dup2(open(), 1)
    system @command;
    open STDOUT, ">&FOO";      # dup2(fileno(FOO), 1)
}
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    -- Chip Salzenberg, Free-Floating Agent of Chaos