csrutil disable
Restart computer
In the terminal, type
sudo open /Applications/TextEdit.app /System/Library/LaunchDaemons/com.apple.ManagedClient.enroll.plist
change
<key>com.apple.ManagedClient.enroll</key>
<true/>
to
<key>com.apple.ManagedClient.enroll</key>
<false/>
So that the changes take effect
Thank you @ParkerPerry , it's been a 'learning experience' the whole way and I appreciate the tips..
It's possible that I'm beyond that advice, since I do not have the ability to set up a functional OS.
"Air gapping" might be one way to allow the installer to set up the user profile without making the deadly search to the Remote Manager?