Hey @glathe, I finally managed to get this to work.
What is missing in these instructions is that - for Ubuntu 24.10 at least - there is other files missing in /usr/share/alsa/ucm2, namely codecs/wsa884x directory and at least codecs/qcom-lpass/wsa-macro/init.conf (I know this one is mentioned re default volume). I just copied the whole codecs/wsa884x and codecs/qcom-lpass from 1.2.13 release of alsa-ucm-conf.
I had no idea what was wrong (no errors in dmesg at least…), but I got a little inquisitive (had no idea what UCM actually is, so I read up a little 
and I run the alsaucm command which reported the missing files. Since I saw these were also included from previously added conf files, I had my culprit(s).