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You can heat the sprocket, just not the teeth. I don't see any penetrating fluid. Use some. Or heat it and throw some paraffin wax on the joint while it is hot. That thing is not only wedged tight, it is also frozen up with permanent side load. Heating would help to release that.
I'd be tempted to weld something onto the end of that that I could chuck into a slide hammer.
Wedge it up and then slide away. As has been said, you need to pry and shock. Sam said tap it from the back side, and that would incrementally put a tiny bit of pressure onto the wedge. You want a wedge that is not so soft that it is going to give.
You will win if you are methodical, and don't get crazy. Spray some fluid on it, think about it, and go back later. Every time you work with it, put a little more fluid on.
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