Summary:
The hose is the most critical part of any Performer's gas-assist, due to how it connects to the burner tube. I honestly don't know what people do if they need to replace that hose, besides pay out the nose to Weber for a compete assembly (and the ones for first-gens might no longer be available.)
Everything aft of the hose, to the tank, can be adapted to the hose. Regulators, tank connections.
Those 1lb tanks ... you sure you wanna go that route? More money spent.