I’ve developed a solution that can be used completely from UMG without touching C++. Its also more performant as we don’t use Scene Capture, I simply grab the viewport and place it in a widget of your choosing.
You can read a more detailed answer here: Split viewport into areas of different contents
Link to the plugin on fab: https://www.fab.com/listings/b8777f94-8b76-4af9-a110-3c6329b31d06