2013 ISX 15 rapid sudden coolant consumption

[Nerv]

Since my ecm file was fixed properly through here(demaned), I wanted to avoid the possibility of the egr failing in the future(since its original). What is the best way to do this without replacing it or having any issues?. They have a kit here that doesnt just block it off but routes a coolant line , does this allow the proper cooling to continue for the rear cylinders? Or does the actual egr provide the cooling?