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@cip1000
I also vote for the one ended hacksaw. As an addition, I'd suggest sellotaping a piece of card or something at the end of the blade so that all the cutting action is on the seatpost and not the frame. Cut 90 degree quadrants almost through, then use big grippy tools on the bit of the seatpost still sticking out.
Sodium Hydroxide probably would need the frame to be stripped of stuff. If you saw before Sodium Hydroxide, the Sodium Hydroxide phase goes a lot faster.