Password a subfolder inside main Dropbox folder

I have been looking into the Espionage trial for the purpose of securing specific folders with a password, not even with encryption. In this case the folder I want to limit access to is inside a Dropbox folder. Not for any true security in case of a true security attack, just to prevent "casual click-through snooping" on a shared machine.
I've read through the recommended workflow for encrypting Dropbox with Espionage, but I am unsure if my request would still require that workflow or not.
If I select a subfolder of the Dropbox folder, and set it to be protected, with no encryption, just a password, and leave it locked by default, would that still cause the sorts of problems that the traditional Espionage-Dropbox workflow is designed to work around? Or would the lack of encryption in this setup avoid complications? Or would it effectively break Dropbox syncing on that folder?
I can see how this question could be confusing, please let me know if it makes sense, or is outright impossible.
Thanks in advance!
I've read through the recommended workflow for encrypting Dropbox with Espionage, but I am unsure if my request would still require that workflow or not.
If I select a subfolder of the Dropbox folder, and set it to be protected, with no encryption, just a password, and leave it locked by default, would that still cause the sorts of problems that the traditional Espionage-Dropbox workflow is designed to work around? Or would the lack of encryption in this setup avoid complications? Or would it effectively break Dropbox syncing on that folder?
I can see how this question could be confusing, please let me know if it makes sense, or is outright impossible.
Thanks in advance!