When you say hose I'm assuming that you have a large tank with a hose that runs up to the Qs regulator and you are not using the small screw on bottles.
Even if you could you would also have to attach the hose to the tank end. Here the adapter hose is crimped and I would not try it due to safety issues plus you would have to make sure you get the right hose so the propane doesn't attack the rubber, if your connection fails it could become ugly.
I know Weber parts are expensive in Norway, but so are hospital bills and burned down homes.
With gas always safety first!