Yes once you reimported your mesh, in the texture set list window, click the Settings dropdown, then choose Reassign Texture Sets.
hmm, so finally got around to trying this, I am not sure I am getting a result expected. btw no object names have changed in the fbx file, just uv's
-So does this work correctly with a UDIM workflow as well?
-Can you just move one object into another texture set, while leaving others intact? Because it seems the best I can do is flip flop texture sets completely.