Ok... after several hours, I was able to pinpoint proper kernel features to be allowed by the Grand Master Of Kludge, systemd, and its minions, rtkit and fedora configuration, to run! I have a very minimal kernel to avoid, as much as I can, interference from other components. I'll start testing from now. Notice UVD and DPM winning in the provided dmesg. I do provide the kernel config file for reference too.