You could make a package that doesn't reference anything else. Slap a function in the object and call it.

package MyIsolatedFunction;

my $singleton = undef;

sub new
    {
    my( $class ) = @_;

    return $singleton if defined $singleton;

    my $self = 0;
    $singleton = bless \$self, $class;

    return $singleton;
    }

sub isolatedFunction
    {
    ... # Normal function stuff here.
    }


1;
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