Nvidia (same card) monitors for simultaneous output w/ pulseaudio on Fedora Silverblue 33

I have two monitors (stereo speakers each) connected via DP and using proprietary NVIDIA drivers.
I would like to combine both monitors into a single audio output so I don’t have to switch between them.

I found this gist which looks like something that could work ( I tried paprefs without luck) however there is two issues with it on silverblue.

First issue which I do not know how to get around is the fact that the script is trying to modify the “/usr/share/pulseaudio/alsa-mixer/profile-sets” while this is read-only on silverblue ( I know I can do the trick with chattr however I am looking for better solution)

So the first question is… “Is there a /etc equivalent which I could modify and get the same results” or some other solution that would work.

Second question is around the flatpaks, I can see that the profile-sets appear in multiple locations:

   /sysroot/ostree/deploy/fedora/var/lib/flatpak/runtime/org.freedesktop.Platform/x86_64/20.08/99666aa95651104a247e446309140c3641d0f43902240b57de11657a2fc1944f/files/share/alsa-card-profile/mixer/profile-sets
   /sysroot/ostree/deploy/fedora/var/lib/flatpak/runtime/org.gnome.Platform/x86_64/3.38/2d64ab24197d5dd64676cb489cc75dc9a408a0c140ff3cf7965e8074708145fa/files/share/alsa-card-profile/mixer/profile-sets
   /sysroot/ostree/deploy/fedora/var/lib/flatpak/runtime/org.kde.Platform/x86_64/5.15/cf2a5865594034feaa9e8e9f428cc2df09999e389f9078a999dae5bb4dff9218/files/share/alsa-card-profile/mixer/profile-sets
   /sysroot/ostree/deploy/fedora/deploy/8eef1db74b848fc108e06cd977cbdb25e39b88e564355082ecd9e4802ec4e297.0/usr/share/alsa-card-profile/mixer/profile-sets
   /sysroot/ostree/deploy/fedora/deploy/8eef1db74b848fc108e06cd977cbdb25e39b88e564355082ecd9e4802ec4e297.0/usr/share/pulseaudio/alsa-mixer/profile-sets
   /usr/share/alsa-card-profile/mixer/profile-sets
   /usr/share/pulseaudio/alsa-mixer/profile-sets
   /var/lib/flatpak/runtime/org.fedoraproject.Platform/x86_64/f33/577d55e05d9046f941ae55cfffad6adf43d773fbf43cefa58b2f2729c27be5d6/files/share/alsa-card-profile/mixer/profile-sets
   /var/lib/flatpak/runtime/org.freedesktop.Platform/x86_64/20.08/99666aa95651104a247e446309140c3641d0f43902240b57de11657a2fc1944f/files/share/alsa-card-profile/mixer/profile-sets
   /var/lib/flatpak/runtime/org.gnome.Platform/x86_64/3.38/2d64ab24197d5dd64676cb489cc75dc9a408a0c140ff3cf7965e8074708145fa/files/share/alsa-card-profile/mixer/profile-sets
   /var/lib/flatpak/runtime/org.kde.Platform/x86_64/5.15/cf2a5865594034feaa9e8e9f428cc2df09999e389f9078a999dae5bb4dff9218/files/share/alsa-card-profile/mixer/profile-sets

Would this mean that I have to modify all of those as well?

This specific question is very pulseaudio specific and you might have a better chance of getting an answer on their bugtracker: https://gitlab.freedesktop.org/pulseaudio/pulseaudio