I have not found any way to direct the messages to an console (tty12) as, I used to do so before systemd.
So I have additional installed rsyslog and it does the job for for that.
I included *.* /dev/tty12 in rsyslog.conf. So all messages come again to that console.
It is surely an overhead but I have found noc way yet to achieve that with systemd.
regards
Reiner