Will I die if I carefully sand the anodising off this seatpost, just the part above the insertion line (i.e. anything extending into the frame I don't touch). I am confident that I won't leave any scratches/dents/etc, if that matters.
I don't think you'll easily be able to sand it off. They have machining marks on, not a smooth surface so you'll have to sand the post smooth to actually get into the grooves. Strip it, as above
Will I die if I carefully sand the anodising off this seatpost, just the part above the insertion line (i.e. anything extending into the frame I don't touch). I am confident that I won't leave any scratches/dents/etc, if that matters.