You can convert to the disposable bottle. You will need the newer regulator-valve.
They fit into the burner tube exactly the same as the old hose does. Its held in with a C clip.
You will need to fab a bracket to mount it somewhere on the cart. Most likely the front panel.
I see that on yours, the wires are cut on the burner tube, so you will need to fix that as well.
You can also get a new OPD fitting for yours and just get a new or refurbished tank.
In t he long run it would be the cheaper way to go.
AJ