Burls Ti CX Di2

or DYI it:
cut your seatpost at an angle a bit below intended insertion point.
drill 6mm hole in the seatpost top along post shft center axis.
install star nut or headset expander in bottom part of the post and attach it with a sufficient length bolt through the top hole.
makes sense, yeah?

^This sounds very promising. If I understand it correctly, it relies on the top of the seatpost being stong enough to take the full force of the clamping bit (as in normal use there's little pressure/force on that side/axis), but a nice bit of lateral thinking all the same!

So I understand a bit better - If using a star nut or headset expander, why would the botton of the seatpost need to be cut at an angle??