If I understood you correctly there is an important limitation in DokuWiki, that makes it impossible to achieve your objective:
There is only one level of rights management.
What that means in detail:
* There is a type of user called "superuser".
* A single user or a group of users are superusers.
* Superusers can assign access rights to all pages and all namespaces to all users, without an exception. That means a superuser has full access to the entire rights management and the user management.
* A user is a superuser or not, that means there is no superuser with limited rights. The supersuper is the only type of user who has access to the rights management.
* Any superuser can make all other users to a superuser or a non-superuser.
(A little redundant, but that perhaps makes it clearer.)
HTH - Michael Sy.
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Configuration Setting: superuser