Running conduit for future electrical work
This sounds like a great plan!
If the attic is easily accessible, the inspector should be able to access it to inspect the conduit sticking up there if he's not satisfied with what she can see in the box itself.
Make sure you look at the different vehicles currently available and the in-wall plugs they need, then get conduit big enough for the wiring and a box big enough to hold the largest plug &amp; wiring. I don't know enough about the amps needed and the plugs required to make a suggestion, but they are bigger than your standard 110v outlet.