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.
This can also be practical in places where the police can force you to unlock your phone with biometrics but not with the PIN.
Ever since I’ve seen the police here force people to delete the videos of them abusing citizens, I have been very wary of biometric identification.
So far my ‘emergency’ procedure would be to restart my phone, as it’s asking for a PIN after a reboot.