Best Approach to separate my lists inside my enterprise wiki site collection into "normal users lists" and into "Admin lists"

1. I added 4 custom lists named; Dept,Area,Category & Priority.
2. I added 4 lookup site columns to reference the above 4 custom lists.
3. i edit the enterprise wiki page layout and i added the 4 custom lookup columns to it.
4. so now each wiki page can be linked to these 4 lookup columns.

and everything worked fine.

but now i am trying to implement this permission settings:-

1. to ONLY allow Site Approver to be able to add new items inside the 4 custom lists; Dept,Area,Category & Priority.
2. while to allow SiteMembers to be able to add/edit/delete wiki pages.

now i am confused on how to implement this permission settings. I tried this .Approach A :-

1. i created a new sub-site named "Admin Section", and i moved the 4 custom lists to be under this sub-site.
2. for the "Admin Section" sub-site. i define a unique permission for it . so only Site Approvers can add/edit/delete items.
3. but the problem i faced is that the 4 site lookup columns will not be able to reference the 4 custom lists since they are defined on a sub-site unlike the 4 site columns which are defined on the root site..

other appraoch which worked for me. Approach B:-

1. is that for the 4 custom lists. i stop inheriting permissions and define that only Approvers can add/edit/delete.
2. in this way no need to create a new "admin section" sub-site. and the site columns can reference the 4 custom lists.

Approach C. which is similar to appraoch B , but works in the other way, mainly  to keep the 4 custom list inheriting permission  from the site,and normal users can only read these list. then for the wiki library and images library, to break the inheritance and allow users to add/edit/delete wiki pages and images.

so can anyone adivce which appraoch i should use ?.