What I would be inclined to do at this point is to make a pair of saw cuts in the unwanted sleeve where the relief slot in the seat tube is. This will remove a section of the sleeve and allow you to crush the sleeve a bit. At that point, if you can remove it, then remove it. If it remains stuck, wick penetrating oil in where you've crushed the sleeve away from the seat tube. Use a thin oil like Kano Kroil. Let it sit for a few days to works in, and then return to trying to extract. Do not rule out the possibility that you have corrosion leading to a chemical fusion between the sleeve and the seat tube. Steel can "rust together", but aluminum corrosion forms a white oxide that can fuse like a weld with other metal surfaces.