Native VBAN Support
You can currently use VBAN (Voicemeeter Audio Network) as an application, but it doesn't provide the sort of experience you'd want. Moving this to a native source/sink would improve this a lot. It's a relatively simple published protocol - and has support for midi as well. This would mean easier and better integration with Windows as well (as this is a common way to use pipewire as a desk area audio router)