You cannot do this as drawn. There is no multiple inheritance (water under the bridge).
You will need two "admin" projects, and move graphics from the current leaf projects:
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Create an inheritable "admin" base project with all projects' graphics. Possibly in the Library project, but I'd make it separate, inheriting the Library. Organize per-project resources into folders for convenience.
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Restructure the leaf projects to only have the unique nav elements they need.
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Create a non-inheritable admin leaf project with the nav and resource switching for admin-only functions and nav for all of the other leaf projects.