giving the steam tip a thermal shock may help. play your blow torch on it for a few seconds (running steam through would be second best), then a glass filed with ice water to chill it quickly., in the absence of any other tools, pliers with a layer of rubber to protect the surface of the tip should then help dislodge it. rubber gloves folded over a couple of times or silicone pot holders will work. this is of course assuming it is removable and not brazed in place.
