Hello, as I had been working on the installer lately [1], I tried to tackle this bug also, I have it mostly working.
I added support for openrc-based init systems. I opted to support both adduser & useradd, changed some tool calls to work on busybox, etc... Then sprinkled a bit of cleanup & polish over the top. It's not finished, because I could not test it. I have a problem building the binary-tarball since I switched to the 1.1.0 release and I've yet to try to build on an earlier version. Stay tuned, patches incoming for review. [1] https://issues.guix.gnu.org/40601 -- Vincent Legoll
