You should be able to use `systemctl --user link` which is a bit nicer than copying.

       link PATH...
           Link a unit file that is not in the unit file search path into the unit
           file search path. This command expects an absolute path to a unit file.
           The effect of this may be undone with disable. The effect of this command
           is that a unit file is made available for commands such as start, even
           though it is not installed directly in the unit search path. The file
           system where the linked unit files are located must be accessible when
           systemd is started (e.g. anything underneath /home/ or /var/ is not
           allowed, unless those directories are located on the root file system).

The cool thing is you can also create .kube file which points to a kubernetes pod definition yaml. This also generates a service definition which takes care of running a full pod with all your containers.

Can you run your stuff on port 80/443 like this?

The generator doesn't do that atm no. Seems like it would be useful though.

On the other hand, I belive systemd would load override files for the generated .service file, although those can just override details on the systemd level, not the generated podman command.