You can give your answers here or on reddit, I don’t mind. I hope someone can help.
In the UV-Editing workspace in the UV-Editor in face mode select any face of an uv-island you which. Select → Select Linked → Linked ( Ctrl-L or also only L). And in the 3D View use Mesh → Split → Selection ( Y ).
If there are many islands then this might be helpfull:
I’m trying to do it all in geometry nodes.
I still need help with this.
The video is showing something with geometry nodes…
You may have to elaborate this to get a more suited answer.