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@lae
I would avoid chiselling between the seatpost and the frame; you could end up with the screwdriver going through the tubing! If the slots you cut go right through the seatpost, the pieces should come straight out with no chiselling required.
Perhaps cut the slots, and fill it up with penetrating oil to hopefully release it. Or ammonia, which does indeed dissolve aluminium oxide (but also paint, probably).