u/DeanDonga

Found this widget/panel integrated audio routing project in kde store. It is very recent. His page in github has 0 stars, so i think you dont know about it. It also have a very nice website in githb.

https://store.kde.org/p/2357238

https://deadlinedoggo.github.io/audiorouter/

https://github.com/DeadlineDoggo/audiorouter