I did a little digging on the SecurityOnion discussion forms and found out they have added a way to include a warning banner on the Login Page of Security Onion 2.3. It looks like it was an undocumented add with 2.3.30 (but was not stable as the unique path would get overwritten on updates.
In 2.3.50 they have added banner.md and it can be updated the same as the Motd.md (Part of the SOC Customization). The file itself is a Markdown file, and here is the Markdown Guide.
To customize the Login Banner content, copy banner.md as follows and then edit /opt/so/saltstack/local/salt/soc/files/soc/banner.md
sudo cp /opt/so/saltstack/default/salt/soc/files/soc/banner.md /opt/so/saltstack/local/salt/soc/files/soc/
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