I use qpwgraph that have the same Idea for pipewire. You can change all your inputs and outputs, I initially used to send the sound of programs to my discord input in order to stream with sound, but I also use to invert L and R when I’m watching on my couch and the wire does not fit to put the right speaker on the right so I just switch.
It is very easy.
Here some video, but I don’t think you will need. www.youtube.com/watch?v=TDBGsbwMo40