Honestly don't know how in 200+ pages of posts, probably 35+ of which are dedicated to discussion on black alternates, someone didn't make the obvious marketing play of SUPER dark blue instead of black.
Most schools have blackouts for big night games. ND can break out the Midnight Blues... we're dressing darker than usual, because it's late and it's time for your funeral.
Have the stadium "blacked" out in Midnight Blue shirts. I think I like this, and it's just enough of a loophole to have plausible deniability when the blue hair dudes with friends in high places start getting grumpy. "It's bad enough that I can't make it to Chicago for a steak after a nighttime kickoff... now we're completely destroying our uniform tradition???"
"Sir, those are Midnight Blues. Still fits within this prescribed University color palette, as you can see here:" [sends link to Google docs form that the geriatric cannot access]