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Okay, so there's a way to do this it seems. For fastRTPS, you can use the following for DEFAULT_FASTRTPS_PROFILES.xml, and place it in the working directory from where you run your ROS 2 nodes.

<?xml version="1.0" encoding="UTF-8" ?>
<profiles>
  <participant profile_name="participant_profile" is_default_profile="true">
    <rtps>
      <builtin>
        <metatrafficUnicastLocatorList>
          <locator/>
        </metatrafficUnicastLocatorList>
        <initialPeersList>
          <locator>
            <udpv4>
              <address>127.0.0.1</address>
            </udpv4>
          </locator>
        </initialPeersList>
      </builtin>
    </rtps>
  </participant>
</profiles>