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@Ndeipi
Turns out this frame had two seized seat posts and a seized eccentric bottom bracket cylinder.
Captain seatpost came out fairly easily, with some penetrating oil and by twisting, using the stoker bars as leverage.
Bottom bracket eccentric cylinder was tougher. It required freezing the whole BB shell to shrink the alu cylinder, applying penetrating oil, and then using a BB tool and a long spanner to turn the BB along with the cylinder.
Stoker seatpost was by far the worst. I tried gripping the square top of the seatpost in a vice and turning the frame. I was worried I'd fold the frame in half so I stopped.
I followed Sheldon's 15 steps and got all the way to number 15, caustic soda. Going through the stoker BB shell, I filled the stoker seat tube with caustic soda solution. I filled and emptied it maybe 7 times, and got lots of heat and nasty foam and fumes.
Finally, I froze the seatpost, added penetrating oil, twisted the post using a saddle and a long spanner and got the glorious POP POP noises. After a lot of brute force I retrieved this razor sharp bad boy right here: