I really did follow your instructions but I didn’t get it to work. We have a theme called Newspaper from tagDiv which seems to want to take over all formatting. I should add that going into the admin code did work but as you note it is a BAD idea and it was, at the best, onlty an experiment to prove that something was possible. As it is that using an innocuous theme allows for the setup and reverting to the Newspaper theme for production is satisfactory. It works.
Thanks again for a fine plugin; it should be part of the WP code.