We already do this every upcp anyways.

maintenance:    if ( -e "/usr/bin/freshclam" ) {
maintenance:        $action{'cmd'} = [ '/usr/bin/freshclam', '--quiet', '-l', '/var/log/clam-update.log' ];
maintenance:    elsif ( -e "/usr/local/bin/freshclam" ) {
maintenance:        $action{'cmd'} = [ '/usr/local/bin/freshclam', '--quiet', '-l', '/var/log/clam-update.log' ];