Two-bath monobaths are not true monobaths. The addition of the fixer concentrate merely stops and fixes the film as in any ordinary B&W process. For a monobath processed negative the bulk of the silver is concentrated near the surface of the emulsion. If you should look a two-bath monobath negative it would look like a conventional negative with the silver distributed throughout the emulsion.
Anyone wishing to experiment with monobaths should read Haist's book. This is the bible on the subject.