I actually looked into this a bit as it is a blast from the past. I remember the transition from gopher to http back in the mid 90s. The first big problem is that anything that runs on a port number under 1024 must be run by root. That is why Gophernicus mentions running under inetd, xinetd, systemd, and I would add tcpserver. So, we would have to install it, and run it, and ensure it is limited to your account and your IP since there is no telling what a PCI compliance scan would think about it.
The other problem is that it isn't in Gentoo's portage repository so we would have to either write a custom ebuild script or manually compile and install it. The only gopher daemon in portage is:
* net-misc/sgopherd
Available versions: ~17.09 ~18.08
Homepage:
https://www.uninformativ.de/git/sgopherd
Description: Small Gopher Server written in GNU Bash
The ~ means that those two versions are still in "testing" even though they are from 2017 and 2018. Also, a daemon written in bash is a little scary.
If you can find a gopher service you can point a DNS A record at that seems to be the way to go.