Dense pack cellulose into the walls, then blow dense pack cellulose on top of the vermiculite in the attic.
Use caulk and backer rod to seal under the bottom plate and then use batts of Roxul to insulate the walls of the crawl space.
No outgassing and no vapor barrier.
For more information:
Read "I want to add wall insulation to my 1920 home. I have two locally available options -- Icynene and Tri-polymer foam. Can you advise me?" a Q&A answered by Alex Georgiou.