I don't see the road closure - even a partial road closure - as being the problem. Downtown in generally dead on a Sunday; how hard would it be to route westbound traffic over the flyover, down 4th ave, and back over the bridge at 10th street? And of course, do the opposite but down 5th for east-bound. If you catch the light sequence right (and usually the lights here are pretty well-timed), it's probably only a couple minutes longer than taking Memorial along that stretch.
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