This reminds me of the
Albany Skyway project where we ended up doing nothing based on how US 9 NB was rerouted. I definitely would not put the point in the center of the post office, but I could see moving the Elkhorn Ave point between Moraine Ave and Ivy Street.
Adding a point on US 36 at the roundabout at the south end of the loop could be useful just to split the difference there.