wp_redirect on base wp-admin and login

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UPDATE : I've done some more research on my problem and have narrowed down the problem further. The question below has been very rewritten from the original. I'm trying set up a plugin to redirect ALL page requests - front-end, admin, login, etc - to an additional code validation page (whether that's advisable or not is moot, it's what the client wants). Based on the functions, hooks, and filters…

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