Is there a shortcut or function to change one of the layers in the multiview to another input?

For instance, I want to change layer 3 to input 47 on one of my shots (input 34).

I see the "SetMultiViewOverlay" function. But that doesn't seem to work for me. I am clearly messing something up.
http://localhost:8088/api/?Function=SetMultiviewOverlay=3,47

But that doesn't tell what the actual input of the input I want to change. So I have input 47 that has 6 layers, and I want layer 3 to change to input 34.

Get it? Hard to explain.

Try the following:

http://127.0.0.1:8088/api/?Function=SetMultiviewOverlay&Input=47&Value=3,34

That should set the multiview layer 3 of input 47 to input 34

cheers,
Richard