The last two upgrades have broken my audio setup.
First the options for Network Server and Network Access in paprefs were greyed out and my sinks disappeared after upgrading to bookworm. I just had to create a link to an existing file and it was working again but, it's weird that it was needed in the first place. Pretty sure it has something to do with the change from pulseaudio to pipewire but I'm not very up to date on that subject and I just want to have my current setup to continue working.
Then yesterday I just launch a simple apt-get upgrade and after rebooting my sinks disappeared again. The network options in paprefs were still available, but changing them did nothing. I had to create the file ~/.config/pipewire/pipewire-pulse.conf.d/10-gsettings.conf and stuff it with "pulse.cmd = [ { cmd = "load-module" args = "module-gsettings" flags = [ "nofail" ] } ]" in order to have my sinks back.
I know it's not only a Debian thing, as I can see this happening to people on Arch forums, but as Debian is supposed to be the "stable" one, I find it amusing that a simple upgrade can break your sound.
AFAIK Kodi can use pulseaudio and probably pipewire. I use Kodi too on those computers and I just leave it to use the default PA device that I've set. I switch the default devices with pasystray.
What's usually breaking for me is paprefs. Every so often after an upgrade, the options are greyed out and I can't share or access my devices over the network.
I never tried to setup simultaneous output before because I just switch from device one to another, but I just enabled it in paprefs and it's working too.