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Oxygen XML Editor offers an add-on that contributes an option in the DITA preferences page (Options > Preferences > DITA) to provide the ability to publish DITA content using DITA-OT 3.x, by default.

To install it the add-on, follow these instructions:
  1. Go to Help > Install new add-ons to open an add-on selection dialog box.
  2. Enter or paste https://www.oxygenxml.com/InstData/Addons/default/updateSite.xml in the Show add-ons from field or select it from the drop-down menu.
  3. Select the DITA-OT 3.x Publishing Engine add-on and click Next.
  4. Select the I accept all terms of the end user license agreement option and click Finish.
  5. Restart the application.

Result: The DITA preferences page will now include a radio button where you can select DITA-OT 3.x as the default publishing engine.

For more information, see the details for this DITA-OT 3.x Publishing Engine add-on in GitHub.