RizomUV Bridge is a Blender add-on from Matt Ashpole that moves objects and UV maps between Blender and RizomUV through a button-driven UI. Export and import run in both directions, and your original objects stay untouched since only UV data is transferred back to Blender.
The add-on handles multiple UV sets and works with FBX, OBJ and USD formats. When using USD, it can save Rizom attributes such as pins and groups. User-controlled preferences let you exclude linked instances from export or automatically mark UV boundaries as sharp on import, so the transfer suits your setup.
Multiple versions are available, each labeled for its RizomUV and Blender combination, and coverage spans Blender 2.8 through 5.0. Install only one version at a time, as enabling several together causes problems. The add-on is distributed under the GPL license.