I don’t have a solution, just a strong feeling that that particular rabbit hole might yield. Not currently exploring it. that would require parts not on hand.
although…there are parts of a home built CO2 extractor lying around the lab i’m currently calling home…
the simplest thing to point to would be SFC eg Super crtical fluid chromatography ppt
but there are other advantages of using ethanol in your CO2 machine, see: Open source CXE retrofit for Co2 extractors