Just an update, the manufacturer of PDLC liquid sells it in 500g bottles for $1250 and doesn't have reseller for smaller quantities. http://www.liquidcrystals.cn/
Per gram it isn't much and will last for long but for prototyping and testing it's too much.
Couldn't find any other source of PDLC mixture, but maybe I'm looking in the wrong places.

Tried extracting from an existing PDLC film but when peeling the PET films from each other some PDLC "paste" stays on one PET film and some on the other.
There must be a way to extract the PDLC paste from an existing film efficiently but I can't think of anything good, PET is a trciky material to dissolve.
And maybe there's some adhesive on the PET with the PDLC you wouldn't want mixed with it upon extraction.