Finally, it is possible to remove initscripts and sysvinit entirely and use only systemd.
Follow the instructions for a mixed systemd/initscripts installation.
Make sure there are no longer any daemons being started by the DAEMONS array
in /etc/rc.conf and that /etc/rc.local and /etc/rc.local.shutdown are both empty.
To replicate the behavior of /etc/rc.local in systemd, see #Emulating /etc/rc.local.
Remove initscripts from your system.
Warning: Do not remove systemd-sysvcompat, as that package is in the base group.