hi,
well i think that you should keep everything working for the main administrator user.
Now, the easy way to have a simplified admin menu is to create a user, editor, publisher or some new function you would invent

and set its right.
This user(s) will have a simplified admin as they will only see what they are allowed to see

that’s what i do for my clients for them not to be afraid of all they could have to do seing a complete admin menu when they will only edit/create pages
have swing