I have no idea why my eyes glazed over this the first time around and why it took me this long to decide to sit down and get it done, but that worked great. In fact, it was as easy as taking Arch's own PKGBUILD, adding the
-D systemd=disabled
flag for Meson to use and removing any systemd dependencies, much like Galeano did earlier.
Later on I'll try to sit down and push this, perhaps along with mpdscribble, to the OUR, since I noticed today that my Obarun GitLab account has been approved.