Different PCM Full Conflictends up [generating 4 profiles with 2 devices per profile] which is a bit broken (I would expect one profile per device). I can get those profiles to create one or two devices in pavucontrol based on which order I activate them, but only one alsa device is actually enabled. Profiles other than these act the same.
I also have that issue on my chromebook with that MR although it's more similar to
Different PCM Pair Conflict, but it doesn't happen with this MR.
(This contains commits from most of my previous MRs, you should check them out first.)