The way I created this was to implement 2 sshd services called wan_sshd
and lan_sshd. I used the existing sshd.service files as templates. See
attached files. This solution reliably works using Ubuntu 18.04.2 LTS
with OpenSSH 7.6p1.

Addition things I had to do:

1) Delete the sshd.service, sshd.socket, and [email protected] in the 
/lib/systemd/system directory.
2) Perform a "sudo systemctl disable ssh". All this does is delete the links to 
the files in step #1.
3) Delete the /etc/rc*.d/S01ssh files.
4) Delete the /etc/init.d/ssh
5) Replace the /etc/default/ssh with the ssh.default in the ZIP file.
6) Delete the /etc/ssh/sshd_config. Add the sshd_*_config files from the ZIP 
file.
7) Add the wan_sshd* and lan_sshd* files to the /lib/systemd/system directory 
from the ZIP file. NOTE: Files called _at.service should be renamed to 
@.service. 
8) Generate your own key files and make appropriate changes to the 
sshd_*_config files.
9) Add the usr_lib_tmpfiles_d.conf from the ZIP file as 
/usr/lib/tmpfiles.d/sshd.conf
10) Reboot the machine and make sure /run/sshd exists BEFORE enabling the 2 
services.

I make the assumption that the reader has the skill set to use systemctl
to get the services started. I also assume the reader has the skill set
to edit a shsd_*_config file.

** Attachment added: "Files from my server that work."
   
https://bugs.launchpad.net/ubuntu/+source/openssh/+bug/1834128/+attachment/5274899/+files/SampleDualServer.zip

** Changed in: openssh (Ubuntu)
       Status: Incomplete => New

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https://bugs.launchpad.net/bugs/1834128

Title:
  Multiple sshd services cannot be executed

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