We would like to make a separate, internal-only knowledge base. Is it possible to have a public department but not display it in the help center?

We would like to make a separate, internal-only knowledge base. Is it possible to have a public department but not display it in the help center?

It seems like it is not possible to display/hide the knowledge base from the help center per department.  Is there a way to do this?

It looks like all department knowledge bases are displayed if they are public, and there is no way to hide one from the help center while keeping it accessible via a permalink URL.

For example, lets say I have one KB for Clients and one for Employees.   

I want to keep my Clients KB public, and also want the Employees KB to be public, but NOT displayed in the help center.

Employees is for internal use, but if I make it private, there's no way to share the link to it. 
If I make it public, it shows up alongside the KB for Clients.   I do not want this.

If I am in the Employee department and turn off "Display KB in Help Center" it does exactly that, for BOTH departments.  In other words, I get NO knowledge base at all.

I want it to appear as if there is ONLY a KB for Clients in the help center, but I would also like to be able to access the Employees department via a link.  Is it possible to do this?