Turned out I don't need alsaconf either. First off, I had no luck with it. Neither the Core 5.x version nor the unmodified 1.0.28 version of the script could find / initialize my sound card.
However, alsa.tcz OnBoot is not enough in my case and loading alsa-config.tcz post boot and issueing sudo /usr/local/etc/init.d/alsasound start doesn't work here. I need to load alsa.tcz plus alsa-config.tcz OnBoot in order for the sound to automagically work. I don't even have to issue /usr/local/etc/init.d/alsasound start in /opt/bootlocal.sh .
So, all good with ALSA.
Maybe I'll try to edit the new alsaconf script like the 5.x version is and see if it can still be useful.