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I'd be wary of deleting all exterior mirrors, ADR's say you must have either interior & drivers exterior, or both exteriors if interior is obstructed. Mirrors are a safety issue and you will be taken off the road (canary) if you don't have minimum requirement.
As above don't stress with the rewiring, seal gaps around lights to stop excess air going through engine bay.
Regarding grille blocking, look at the airflow that will occur, if you were an air molecule, when you (the air) get through the grill, what options are there, you will take the path of least resistance, If you have the opportunity to go straight through a gaping hole beside the radiator or through a tightly meshed radiator with lots of fins to get around, where you gunna go?
If all other holes are blocked to the engine bay from the front you'd be surprised at how little grille is actually required to just feed the radiator. By blocking all the side holes and directing more air over and around vehicle, then a negative pressure is created in the engine bay which actually sucks the air through the radiator.
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