To hopefully fix this, I ordered this kit, which has an assortment of connectors, but I only needed two of the the 1-1 couplers. The kit looks similar to many others on Amazon, and works well. The included connectors went right into the remaining hose without much complaint. I measured the inside and outside diameters of the stock hose and it was 7mm outside and 5mm inside, though it is corrugated.
The install was simple aside from a crazy double reverse latching hose clamp, which surely deserves a design award. I had to set a flat screwdriver in a vice (set to pry one side open) while using another flat screwdriver in one hand (to pry the other side), and held the clip in the other hand, in order to open it up. The only thing that makes sense is that Ford has access to 3 handed alien tech, likely through their connections with the lizard persons...who I assume also have 3 hands. Oddly the other hose clamps were of the simple (human based) one side clip design, so I'm not sure why they made this one extra spicy: