Those are some great illustration videos. Till something helpful for implementing it there are complex ways around it even without track brakes or ratarders like friction an brakes.
Even for future testing purposes I wasted no time developing a new yard in benefit for 2 existing routes for future merges. I put the humps to normal real instead of steep steep for the cars to keep rolling on the hill under emergency till on flat land to stop.
Here is the video humping just a few at a time instead of one. Seams its safe to minimum set the train, bleed 1 car with the other maintaining its minimum set bottling the air (Close each angle cock side of the cut of cars humped).