I was wondering the same thing. I haven’t yet installed uCore though.
Or better yet, could we contribute that to uCore itself? Perhaps disabled by default but easy to enable for folks who want it?
The project’s lead is thinking about retiring uCore, so I’m not sure it would be worth it. And the README on the Github repo does say that there are upstream efforts to develop an alternative.
However, as I wrote in the other thread, I think @bsherman’s suggestion to use CentOS bootc image as base is the right idea. I find the whole butane/ignition thing to be a bit too outside the usual container practices. I think I’m going to base by home server on CentOS bootc instead.
And yes, I’d consider a systemd unit. I’ve been running wild with systemd user units since @CerealParadox shared his config snippet for his starship prompt. 
(I made one for brew updates and one for dnf updates for my Fedora WSL at work.)
Tip: there’s a VS Code extension for Systemd unit files: